Update Windows installer to use .exe extension and refactor validation logic

- Changed the installer file extension from `.msi` to `.exe` in both `appupdate.js` and `winappupdate.js` to align with the new installation format.
- Refactored the validation function to check for Windows executables instead of MSI packages, enhancing compatibility with the updated installer format.

public/appupdate.js

@@ -15,7 +15,7 @@ const SUPPORTED_TARGETS = {
     osMatchers: ['darwin', 'mac', 'macos', 'osx']
   },
   win32: {
-    extension: '.msi',
+    extension: '.exe',
     osMatchers: ['win32', 'win', 'windows']
   }
 }

public/winappupdate.js

@@ -2,143 +2,20 @@ import { spawn } from 'child_process'
 import { promises as fs } from 'fs'
 import os from 'os'
 import path from 'path'
-import process from 'process'
 
-const MSI_OLE_HEADER = Buffer.from([0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1])
+const MZ_HEADER = Buffer.from([0x4d, 0x5a])
 const DEBUG_PREFIX = '[app-update][win-progress]'
 
 const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))
 
 const debugLog = () => {}
 
-const decodeMsiLogBuffer = (buffer) => {
+const isValidWindowsExecutable = async (filePath) => {
-  if (!buffer?.length) return ''
-
-  if (buffer.length >= 2 && buffer[0] === 0xff && buffer[1] === 0xfe) {
-    debugLog('decoded MSI log as UTF-16 LE (BOM)')
-    return buffer.subarray(2).toString('utf16le')
-  }
-
-  const sample = buffer.subarray(0, Math.min(buffer.length, 64))
-  const looksUtf16 =
-    sample.length >= 4 &&
-    sample.filter((byte) => byte === 0).length > sample.length / 4
-
-  if (looksUtf16) {
-    debugLog('decoded MSI log as UTF-16 LE (heuristic)')
-    return buffer.toString('utf16le')
-  }
-
-  debugLog('decoded MSI log as UTF-8')
-  return buffer.toString('utf8')
-}
-
-const formatMsiActionName = (actionName) => {
-  const humanized = String(actionName)
-    .replace(/([a-z])([A-Z])/g, '$1 $2')
-    .replace(/_/g, ' ')
-    .toLowerCase()
-    .trim()
-
-  if (!humanized) return 'Installing update...'
-
-  return `${humanized.charAt(0).toUpperCase()}${humanized.slice(1)}...`
-}
-
-const parseWindowsInstallerProgress = (output) => {
-  const lines = String(output || '').split(/\r?\n/)
-  let percent = null
-  let message = 'Installing update...'
-  let totalTicks = 0
-  let currentTicks = 0
-  let actionStarts = 0
-  let actionEnds = 0
-  const matchedLines = []
-
-  for (const line of lines) {
-    const actionStart = line.match(/^Action start \d{2}:\d{2}:\d{2}: (.+?)\./)
-    if (actionStart) {
-      actionStarts += 1
-      message = formatMsiActionName(actionStart[1])
-      matchedLines.push(`action-start:${actionStart[1]}`)
-    }
-
-    const doingAction = line.match(/Doing action:\s*(.+)$/)
-    if (doingAction && !actionStart) {
-      message = formatMsiActionName(doingAction[1])
-      matchedLines.push(`doing-action:${doingAction[1]}`)
-    }
-
-    if (/^Action ended \d{2}:\d{2}:\d{2}: .+?\. Return value \d+\./.test(line)) {
-      actionEnds += 1
-      matchedLines.push('action-ended')
-    }
-
-    const progressReset = line.match(/^\s*0\s+(\d+)\s+0(?:\s+\d+)?\s*$/)
-    if (progressReset) {
-      totalTicks = Number.parseInt(progressReset[1], 10) || 0
-      currentTicks = 0
-      matchedLines.push(`progress-reset:${totalTicks}`)
-    }
-
-    const progressIncrement = line.match(/^\s*2\s+(\d+)\s*$/)
-    if (progressIncrement) {
-      currentTicks += Number.parseInt(progressIncrement[1], 10) || 0
-      matchedLines.push(`progress-increment:${progressIncrement[1]}`)
-    }
-
-    const progressAddition = line.match(/^\s*3\s+(\d+)\s*$/)
-    if (progressAddition) {
-      totalTicks += Number.parseInt(progressAddition[1], 10) || 0
-      matchedLines.push(`progress-addition:${progressAddition[1]}`)
-    }
-
-    if (/Installation success or error status:\s*0\b/.test(line)) {
-      percent = 100
-      message = 'Installation complete. Restarting Farm Control...'
-      matchedLines.push('install-success')
-    }
-  }
-
-  if (percent !== 100) {
-    if (totalTicks > 0) {
-      percent = Math.min(99, Math.round((currentTicks / totalTicks) * 100))
-    } else if (actionStarts > 0) {
-      percent = Math.min(
-        95,
-        Math.max(5, Math.round((actionEnds / actionStarts) * 90))
-      )
-    }
-  }
-
-  return {
-    percent,
-    message,
-    stats: {
-      lineCount: lines.length,
-      actionStarts,
-      actionEnds,
-      totalTicks,
-      currentTicks,
-      matchedLines: matchedLines.slice(-8)
-    }
-  }
-}
-
-const isWindowsInstallSuccessful = (output) =>
-  /Installation success or error status:\s*0\b/.test(output) ||
-  /MainEngineThread is returning 0\b/.test(output)
-
-const isWindowsInstallFailed = (output) =>
-  /Installation success or error status:\s*[1-9]\d*\b/.test(output) ||
-  /MainEngineThread is returning [1-9]\d*\b/.test(output)
-
-const isValidMsiPackage = async (filePath) => {
   const handle = await fs.open(filePath, 'r')
   try {
-    const header = Buffer.alloc(MSI_OLE_HEADER.length)
+    const header = Buffer.alloc(MZ_HEADER.length)
     await handle.read(header, 0, header.length, 0)
-    return header.equals(MSI_OLE_HEADER)
+    return header.equals(MZ_HEADER)
   } finally {
     await handle.close()
   }
@@ -158,7 +35,6 @@ const prepareInstallerPath = async (installerPath) => {
   const stablePath = path.join(updateDir, fileName)
   await fs.copyFile(installerPath, stablePath)
 
-  // Resolve to a canonical long path. Short 8.3 paths (e.g. ADMINI~1) break msiexec.
   const resolvedPath = await fs.realpath(stablePath)
   const stats = await fs.stat(resolvedPath)
 
@@ -166,118 +42,20 @@ const prepareInstallerPath = async (installerPath) => {
     throw new Error('Update installer file is missing or empty.')
   }
 
-  if (!(await isValidMsiPackage(resolvedPath))) {
+  if (!(await isValidWindowsExecutable(resolvedPath))) {
     throw new Error(
-      'Downloaded update is not a valid Windows Installer package. The file may be corrupted or incomplete.'
+      'Downloaded update is not a valid Windows installer. The file may be corrupted or incomplete.'
     )
   }
 
   return resolvedPath
 }
 
-const startWindowsInstallerProgressWatch = (
+const readInstallerLog = async (logPath) => {
-  logPath,
+  try {
-  webContents,
+    return await fs.readFile(logPath, 'utf8')
-  sendProgress
+  } catch {
-) => {
+    return ''
-  let installerOutput = ''
-  let lastLogSize = 0
-  let lastPercent = null
-  let lastMessage = null
-  let pollCount = 0
-
-  const poll = async () => {
-    pollCount += 1
-
-    try {
-      const stat = await fs.stat(logPath)
-      if (stat.size === 0) {
-        debugLog(`poll #${pollCount}: log exists but is empty`, { logPath })
-        return
-      }
-
-      if (stat.size === lastLogSize) {
-        debugLog(`poll #${pollCount}: no new log data`, {
-          logPath,
-          size: stat.size
-        })
-        return
-      }
-
-      const buffer = Buffer.alloc(stat.size)
-      const handle = await fs.open(logPath, 'r')
-      try {
-        await handle.read(buffer, 0, stat.size, 0)
-      } finally {
-        await handle.close()
-      }
-
-      lastLogSize = stat.size
-      installerOutput = decodeMsiLogBuffer(buffer)
-
-      const { percent, message, stats } =
-        parseWindowsInstallerProgress(installerOutput)
-      const resolvedPercent = percent ?? lastPercent ?? 0
-      const resolvedMessage = message || 'Installing update...'
-
-      debugLog(`poll #${pollCount}: parsed installer log`, {
-        logPath,
-        size: stat.size,
-        textLength: installerOutput.length,
-        preview: installerOutput.slice(0, 240).replace(/\s+/g, ' '),
-        parsed: stats,
-        resolvedPercent,
-        resolvedMessage
-      })
-
-      if (
-        resolvedPercent !== lastPercent ||
-        resolvedMessage !== lastMessage
-      ) {
-        debugLog(`poll #${pollCount}: sending progress update`, {
-          percent: resolvedPercent,
-          message: resolvedMessage
-        })
-
-        lastPercent = resolvedPercent
-        lastMessage = resolvedMessage
-        sendProgress(webContents, {
-          phase: 'installing',
-          percent: resolvedPercent,
-          message: resolvedMessage
-        })
-      } else {
-        debugLog(`poll #${pollCount}: progress unchanged, skipping UI update`, {
-          percent: resolvedPercent,
-          message: resolvedMessage
-        })
-      }
-    } catch (error) {
-      if (error?.code === 'ENOENT') {
-        debugLog(`poll #${pollCount}: log file not created yet`, { logPath })
-        return
-      }
-
-      console.error(`${DEBUG_PREFIX} installer log poll error:`, error)
-    }
-  }
-
-  const intervalId = setInterval(() => {
-    poll().catch((error) => {
-      console.error(`${DEBUG_PREFIX} installer log poll error:`, error)
-    })
-  }, 300)
-
-  return async () => {
-    clearInterval(intervalId)
-    await poll()
-    debugLog('stopped progress watch', {
-      logPath,
-      finalSize: lastLogSize,
-      textLength: installerOutput.length,
-      pollCount
-    })
-    return installerOutput
   }
 }
 
@@ -304,71 +82,42 @@ export const launchWindowsInstaller = async (
 
   await fs.unlink(logPath).catch(() => {})
 
-  // Allow file handles from the download/copy to settle before msiexec opens the MSI.
   await sleep(2000)
 
-  const stopProgressWatch = startWindowsInstallerProgressWatch(
-    logPath,
-    webContents,
-    sendProgress
-  )
-
   return new Promise((resolve, reject) => {
     let processOutput = ''
     const startedAt = Date.now()
 
-    const installerArgs = [
+    const installerArgs = ['/S', `/LOG=${logPath}`]
-      '/i',
-      resolvedPath,
-      '/qn',
-      '/norestart',
-      '/L*v!',
-      logPath
-    ]
 
-    debugLog('spawning msiexec', {
+    debugLog('spawning NSIS installer', {
+      installerPath: resolvedPath,
       args: installerArgs,
       elapsedMs: Date.now() - startedAt
     })
 
-    const installerProcess = spawn('msiexec.exe', installerArgs, {
+    const installerProcess = spawn(resolvedPath, installerArgs, {
       stdio: ['ignore', 'pipe', 'pipe'],
       windowsHide: true
     })
 
     installerProcess.stdout?.on('data', (data) => {
-      const text = data.toString('utf16le')
+      processOutput += data.toString('utf8')
-      processOutput += text
-      debugLog('msiexec stdout chunk', {
-        length: text.length,
-        preview: text.slice(0, 200)
-      })
     })
 
     installerProcess.stderr?.on('data', (data) => {
-      const text = data.toString('utf16le')
+      processOutput += data.toString('utf8')
-      processOutput += text
-      debugLog('msiexec stderr chunk', {
-        length: text.length,
-        preview: text.slice(0, 200)
-      })
     })
 
     installerProcess.on('spawn', () => {
-      debugLog('msiexec spawned', {
+      debugLog('installer spawned', {
         pid: installerProcess.pid,
         elapsedMs: Date.now() - startedAt
       })
     })
 
-    installerProcess.on('error', async (error) => {
+    installerProcess.on('error', (error) => {
       console.error(`${DEBUG_PREFIX} installer spawn error:`, error)
-      const watchedOutput = await stopProgressWatch()
-
-      debugLog('installer spawn failed', {
-        watchedOutputLength: watchedOutput.length,
-        processOutputLength: processOutput.length
-      })
 
       const message = error?.message || 'Failed to start update installer.'
       sendProgress(webContents, {
@@ -380,24 +129,24 @@ export const launchWindowsInstaller = async (
     })
 
     installerProcess.on('exit', async (code, signal) => {
-      const watchedOutput = await stopProgressWatch()
+      const logOutput = await readInstallerLog(logPath)
-      const output = watchedOutput || processOutput
+      const output = [processOutput, logOutput].filter(Boolean).join('\n')
-      const finalParse = parseWindowsInstallerProgress(output)
 
-      debugLog('msiexec exited', {
+      debugLog('installer exited', {
         code,
         signal,
         elapsedMs: Date.now() - startedAt,
-        watchedOutputLength: watchedOutput.length,
+        logOutputLength: logOutput.length,
         processOutputLength: processOutput.length,
-        parsed: finalParse.stats,
         outputPreview: output.slice(0, 500).replace(/\s+/g, ' ')
       })
 
       debugLog('keeping install log', { logPath })
 
       if (code !== 0) {
-        const message = getInstallErrorMessage(null, output)
+        const message =
+          getInstallErrorMessage(null, output) ||
+          `Update installer failed with exit code ${code ?? 'unknown'}.`
         sendProgress(webContents, {
           phase: 'error',
           percent: null,
@@ -407,34 +156,10 @@ export const launchWindowsInstaller = async (
         return
       }
 
-      const succeeded =
-        isWindowsInstallSuccessful(output) ||
-        (code === 0 && !isWindowsInstallFailed(output))
-
-      debugLog('install success evaluation', {
-        succeeded,
-        isSuccessful: isWindowsInstallSuccessful(output),
-        isFailed: isWindowsInstallFailed(output),
-        exitCode: code
-      })
-
-      if (!succeeded) {
-        const message = getInstallErrorMessage(null, output)
-        sendProgress(webContents, {
-          phase: 'error',
-          percent: null,
-          message
-        })
-        reject(new Error(message))
-        return
-      }
-
-      const { percent, message } = finalParse
-
       sendProgress(webContents, {
         phase: 'installing',
-        percent: percent ?? 100,
+        percent: 100,
-        message: message || 'Installation complete. Restarting Farm Control...'
+        message: 'Installation complete. Restarting Farm Control...'
       })
 
       debugLog('installer completed successfully')

src/desktop/appupdate.js

@@ -15,7 +15,7 @@ const SUPPORTED_TARGETS = {
     osMatchers: ["darwin", "mac", "macos", "osx"],
   },
   win32: {
-    extension: ".msi",
+    extension: ".exe",
     osMatchers: ["win32", "win", "windows"],
   },
 };

src/desktop/winappupdate.js

@@ -2,143 +2,20 @@ import { spawn } from 'child_process'
 import { promises as fs } from 'fs'
 import os from 'os'
 import path from 'path'
-import process from 'process'
 
-const MSI_OLE_HEADER = Buffer.from([0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1])
+const MZ_HEADER = Buffer.from([0x4d, 0x5a])
 const DEBUG_PREFIX = '[app-update][win-progress]'
 
 const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))
 
 const debugLog = () => {}
 
-const decodeMsiLogBuffer = (buffer) => {
+const isValidWindowsExecutable = async (filePath) => {
-  if (!buffer?.length) return ''
-
-  if (buffer.length >= 2 && buffer[0] === 0xff && buffer[1] === 0xfe) {
-    debugLog('decoded MSI log as UTF-16 LE (BOM)')
-    return buffer.subarray(2).toString('utf16le')
-  }
-
-  const sample = buffer.subarray(0, Math.min(buffer.length, 64))
-  const looksUtf16 =
-    sample.length >= 4 &&
-    sample.filter((byte) => byte === 0).length > sample.length / 4
-
-  if (looksUtf16) {
-    debugLog('decoded MSI log as UTF-16 LE (heuristic)')
-    return buffer.toString('utf16le')
-  }
-
-  debugLog('decoded MSI log as UTF-8')
-  return buffer.toString('utf8')
-}
-
-const formatMsiActionName = (actionName) => {
-  const humanized = String(actionName)
-    .replace(/([a-z])([A-Z])/g, '$1 $2')
-    .replace(/_/g, ' ')
-    .toLowerCase()
-    .trim()
-
-  if (!humanized) return 'Installing update...'
-
-  return `${humanized.charAt(0).toUpperCase()}${humanized.slice(1)}...`
-}
-
-const parseWindowsInstallerProgress = (output) => {
-  const lines = String(output || '').split(/\r?\n/)
-  let percent = null
-  let message = 'Installing update...'
-  let totalTicks = 0
-  let currentTicks = 0
-  let actionStarts = 0
-  let actionEnds = 0
-  const matchedLines = []
-
-  for (const line of lines) {
-    const actionStart = line.match(/^Action start \d{2}:\d{2}:\d{2}: (.+?)\./)
-    if (actionStart) {
-      actionStarts += 1
-      message = formatMsiActionName(actionStart[1])
-      matchedLines.push(`action-start:${actionStart[1]}`)
-    }
-
-    const doingAction = line.match(/Doing action:\s*(.+)$/)
-    if (doingAction && !actionStart) {
-      message = formatMsiActionName(doingAction[1])
-      matchedLines.push(`doing-action:${doingAction[1]}`)
-    }
-
-    if (/^Action ended \d{2}:\d{2}:\d{2}: .+?\. Return value \d+\./.test(line)) {
-      actionEnds += 1
-      matchedLines.push('action-ended')
-    }
-
-    const progressReset = line.match(/^\s*0\s+(\d+)\s+0(?:\s+\d+)?\s*$/)
-    if (progressReset) {
-      totalTicks = Number.parseInt(progressReset[1], 10) || 0
-      currentTicks = 0
-      matchedLines.push(`progress-reset:${totalTicks}`)
-    }
-
-    const progressIncrement = line.match(/^\s*2\s+(\d+)\s*$/)
-    if (progressIncrement) {
-      currentTicks += Number.parseInt(progressIncrement[1], 10) || 0
-      matchedLines.push(`progress-increment:${progressIncrement[1]}`)
-    }
-
-    const progressAddition = line.match(/^\s*3\s+(\d+)\s*$/)
-    if (progressAddition) {
-      totalTicks += Number.parseInt(progressAddition[1], 10) || 0
-      matchedLines.push(`progress-addition:${progressAddition[1]}`)
-    }
-
-    if (/Installation success or error status:\s*0\b/.test(line)) {
-      percent = 100
-      message = 'Installation complete. Restarting Farm Control...'
-      matchedLines.push('install-success')
-    }
-  }
-
-  if (percent !== 100) {
-    if (totalTicks > 0) {
-      percent = Math.min(99, Math.round((currentTicks / totalTicks) * 100))
-    } else if (actionStarts > 0) {
-      percent = Math.min(
-        95,
-        Math.max(5, Math.round((actionEnds / actionStarts) * 90))
-      )
-    }
-  }
-
-  return {
-    percent,
-    message,
-    stats: {
-      lineCount: lines.length,
-      actionStarts,
-      actionEnds,
-      totalTicks,
-      currentTicks,
-      matchedLines: matchedLines.slice(-8)
-    }
-  }
-}
-
-const isWindowsInstallSuccessful = (output) =>
-  /Installation success or error status:\s*0\b/.test(output) ||
-  /MainEngineThread is returning 0\b/.test(output)
-
-const isWindowsInstallFailed = (output) =>
-  /Installation success or error status:\s*[1-9]\d*\b/.test(output) ||
-  /MainEngineThread is returning [1-9]\d*\b/.test(output)
-
-const isValidMsiPackage = async (filePath) => {
   const handle = await fs.open(filePath, 'r')
   try {
-    const header = Buffer.alloc(MSI_OLE_HEADER.length)
+    const header = Buffer.alloc(MZ_HEADER.length)
     await handle.read(header, 0, header.length, 0)
-    return header.equals(MSI_OLE_HEADER)
+    return header.equals(MZ_HEADER)
   } finally {
     await handle.close()
   }
@@ -158,7 +35,6 @@ export const prepareInstallerPath = async (installerPath) => {
   const stablePath = path.join(updateDir, fileName)
   await fs.copyFile(installerPath, stablePath)
 
-  // Resolve to a canonical long path. Short 8.3 paths (e.g. ADMINI~1) break msiexec.
   const resolvedPath = await fs.realpath(stablePath)
   const stats = await fs.stat(resolvedPath)
 
@@ -166,114 +42,20 @@ export const prepareInstallerPath = async (installerPath) => {
     throw new Error('Update installer file is missing or empty.')
   }
 
-  if (!(await isValidMsiPackage(resolvedPath))) {
+  if (!(await isValidWindowsExecutable(resolvedPath))) {
     throw new Error(
-      'Downloaded update is not a valid Windows Installer package. The file may be corrupted or incomplete.'
+      'Downloaded update is not a valid Windows installer. The file may be corrupted or incomplete.'
     )
   }
 
   return resolvedPath
 }
 
-const startWindowsInstallerProgressWatch = (logPath, sendProgress) => {
+const readInstallerLog = async (logPath) => {
-  let installerOutput = ''
+  try {
-  let lastLogSize = 0
+    return await fs.readFile(logPath, 'utf8')
-  let lastPercent = null
+  } catch {
-  let lastMessage = null
+    return ''
-  let pollCount = 0
-
-  const poll = async () => {
-    pollCount += 1
-
-    try {
-      const stat = await fs.stat(logPath)
-      if (stat.size === 0) {
-        debugLog(`poll #${pollCount}: log exists but is empty`, { logPath })
-        return
-      }
-
-      if (stat.size === lastLogSize) {
-        debugLog(`poll #${pollCount}: no new log data`, {
-          logPath,
-          size: stat.size
-        })
-        return
-      }
-
-      const buffer = Buffer.alloc(stat.size)
-      const handle = await fs.open(logPath, 'r')
-      try {
-        await handle.read(buffer, 0, stat.size, 0)
-      } finally {
-        await handle.close()
-      }
-
-      lastLogSize = stat.size
-      installerOutput = decodeMsiLogBuffer(buffer)
-
-      const { percent, message, stats } =
-        parseWindowsInstallerProgress(installerOutput)
-      const resolvedPercent = percent ?? lastPercent ?? 0
-      const resolvedMessage = message || 'Installing update...'
-
-      debugLog(`poll #${pollCount}: parsed installer log`, {
-        logPath,
-        size: stat.size,
-        textLength: installerOutput.length,
-        preview: installerOutput.slice(0, 240).replace(/\s+/g, ' '),
-        parsed: stats,
-        resolvedPercent,
-        resolvedMessage
-      })
-
-      if (
-        resolvedPercent !== lastPercent ||
-        resolvedMessage !== lastMessage
-      ) {
-        debugLog(`poll #${pollCount}: sending progress update`, {
-          percent: resolvedPercent,
-          message: resolvedMessage
-        })
-
-        lastPercent = resolvedPercent
-        lastMessage = resolvedMessage
-        sendProgress( {
-          phase: 'installing',
-          percent: resolvedPercent,
-          message: resolvedMessage
-        })
-      } else {
-        debugLog(`poll #${pollCount}: progress unchanged, skipping UI update`, {
-          percent: resolvedPercent,
-          message: resolvedMessage
-        })
-      }
-    } catch (error) {
-      if (error?.code === 'ENOENT') {
-        debugLog(`poll #${pollCount}: log file not created yet`, { logPath })
-        return
-      }
-
-      console.error(`${DEBUG_PREFIX} installer log poll error:`, error)
-    }
-  }
-
-  const intervalId = setInterval(() => {
-    poll().catch((error) => {
-      console.error(`${DEBUG_PREFIX} installer log poll error:`, error)
-    })
-  }, 300)
-
-  return async () => {
-    clearInterval(intervalId)
-    await poll()
-    debugLog('stopped progress watch', {
-      logPath,
-      finalSize: lastLogSize,
-      textLength: installerOutput.length,
-      pollCount
-    })
-    return installerOutput
   }
 }
 
@@ -292,7 +74,7 @@ export const launchWindowsInstaller = async (
     logPath
   })
 
-  sendProgress( {
+  sendProgress({
     phase: 'installing',
     percent: 0,
     message: 'Installing update...'
@@ -300,73 +82,45 @@ export const launchWindowsInstaller = async (
 
   await fs.unlink(logPath).catch(() => {})
 
-  // Allow file handles from the download/copy to settle before msiexec opens the MSI.
   await sleep(2000)
 
-  const stopProgressWatch = startWindowsInstallerProgressWatch(
-    logPath,
-    sendProgress
-  )
-
   return new Promise((resolve, reject) => {
     let processOutput = ''
     const startedAt = Date.now()
 
-    const installerArgs = [
+    const installerArgs = ['/S', `/LOG=${logPath}`]
-      '/i',
-      resolvedPath,
-      '/qn',
-      '/norestart',
-      '/L*v!',
-      logPath
-    ]
 
-    debugLog('spawning msiexec', {
+    debugLog('spawning NSIS installer', {
+      installerPath: resolvedPath,
       args: installerArgs,
       elapsedMs: Date.now() - startedAt
     })
 
-    const installerProcess = spawn('msiexec.exe', installerArgs, {
+    const installerProcess = spawn(resolvedPath, installerArgs, {
       stdio: ['ignore', 'pipe', 'pipe'],
       windowsHide: true
     })
 
     installerProcess.stdout?.on('data', (data) => {
-      const text = data.toString('utf16le')
+      processOutput += data.toString('utf8')
-      processOutput += text
-      debugLog('msiexec stdout chunk', {
-        length: text.length,
-        preview: text.slice(0, 200)
-      })
     })
 
     installerProcess.stderr?.on('data', (data) => {
-      const text = data.toString('utf16le')
+      processOutput += data.toString('utf8')
-      processOutput += text
-      debugLog('msiexec stderr chunk', {
-        length: text.length,
-        preview: text.slice(0, 200)
-      })
     })
 
     installerProcess.on('spawn', () => {
-      debugLog('msiexec spawned', {
+      debugLog('installer spawned', {
         pid: installerProcess.pid,
         elapsedMs: Date.now() - startedAt
       })
     })
 
-    installerProcess.on('error', async (error) => {
+    installerProcess.on('error', (error) => {
       console.error(`${DEBUG_PREFIX} installer spawn error:`, error)
-      const watchedOutput = await stopProgressWatch()
-
-      debugLog('installer spawn failed', {
-        watchedOutputLength: watchedOutput.length,
-        processOutputLength: processOutput.length
-      })
 
       const message = error?.message || 'Failed to start update installer.'
-      sendProgress( {
+      sendProgress({
         phase: 'error',
         percent: null,
         message
@@ -375,25 +129,25 @@ export const launchWindowsInstaller = async (
     })
 
     installerProcess.on('exit', async (code, signal) => {
-      const watchedOutput = await stopProgressWatch()
+      const logOutput = await readInstallerLog(logPath)
-      const output = watchedOutput || processOutput
+      const output = [processOutput, logOutput].filter(Boolean).join('\n')
-      const finalParse = parseWindowsInstallerProgress(output)
 
-      debugLog('msiexec exited', {
+      debugLog('installer exited', {
         code,
         signal,
         elapsedMs: Date.now() - startedAt,
-        watchedOutputLength: watchedOutput.length,
+        logOutputLength: logOutput.length,
         processOutputLength: processOutput.length,
-        parsed: finalParse.stats,
         outputPreview: output.slice(0, 500).replace(/\s+/g, ' ')
       })
 
       debugLog('keeping install log', { logPath })
 
       if (code !== 0) {
-        const message = getInstallErrorMessage(null, output)
+        const message =
-        sendProgress( {
+          getInstallErrorMessage(null, output) ||
+          `Update installer failed with exit code ${code ?? 'unknown'}.`
+        sendProgress({
           phase: 'error',
           percent: null,
           message
@@ -402,34 +156,10 @@ export const launchWindowsInstaller = async (
         return
       }
 
-      const succeeded =
+      sendProgress({
-        isWindowsInstallSuccessful(output) ||
-        (code === 0 && !isWindowsInstallFailed(output))
-
-      debugLog('install success evaluation', {
-        succeeded,
-        isSuccessful: isWindowsInstallSuccessful(output),
-        isFailed: isWindowsInstallFailed(output),
-        exitCode: code
-      })
-
-      if (!succeeded) {
-        const message = getInstallErrorMessage(null, output)
-        sendProgress( {
-          phase: 'error',
-          percent: null,
-          message
-        })
-        reject(new Error(message))
-        return
-      }
-
-      const { percent, message } = finalParse
-
-      sendProgress( {
         phase: 'installing',
-        percent: percent ?? 100,
+        percent: 100,
-        message: message || 'Installation complete. Restarting Farm Control...'
+        message: 'Installation complete. Restarting Farm Control...'
       })
 
       debugLog('installer completed successfully')