diff --git a/src/components/Dashboard/context/AppUpdateContext.jsx b/src/components/Dashboard/context/AppUpdateContext.jsx
index 7589525..da220a8 100644
--- a/src/components/Dashboard/context/AppUpdateContext.jsx
+++ b/src/components/Dashboard/context/AppUpdateContext.jsx
@@ -130,6 +130,10 @@ export const AppUpdateProvider = ({ children }) => {
     setAppSettings,
     getAppEngine,
     startAppUpdate,
+    checkAppUpdateResult,
+    checkDuplicateInstallations,
+    removeDuplicateInstallations,
+    onDuplicateInstallationsRemoved,
     onAppUpdateProgress,
     onCheckForUpdatesRequest
   } = useContext(ElectronContext)
@@ -139,6 +143,11 @@ export const AppUpdateProvider = ({ children }) => {
   const [updatePromptOpen, setUpdatePromptOpen] = useState(false)
   const [installingUpdate, setInstallingUpdate] = useState(null)
   const [updateProgress, setUpdateProgress] = useState(null)
+  const [completedUpdate, setCompletedUpdate] = useState(null)
+  const [duplicateInstall, setDuplicateInstall] = useState(null)
+  const [duplicatePromptOpen, setDuplicatePromptOpen] = useState(false)
+  const [removingDuplicate, setRemovingDuplicate] = useState(false)
+  const [duplicateRemovalResult, setDuplicateRemovalResult] = useState(null)
   const runningCheckRef = useRef(null)
   const updateCheckDependenciesRef = useRef({})
 
@@ -293,6 +302,44 @@ export const AppUpdateProvider = ({ children }) => {
     }
   }, [isElectron, showUpdateIfAvailable])
 
+  useEffect(() => {
+    if (!isElectron) return undefined
+
+    let cancelled = false
+
+    const runStartupChecks = async () => {
+      try {
+        const result = await checkAppUpdateResult?.()
+        if (!cancelled && result?.updated) {
+          setCompletedUpdate(result)
+        }
+
+        const installations = await checkDuplicateInstallations?.()
+        if (!cancelled && installations?.duplicatePath) {
+          setDuplicateInstall(installations)
+          setDuplicatePromptOpen(true)
+        }
+      } catch (error) {
+        console.warn('[AppUpdateContext] Startup update checks failed:', error)
+      }
+    }
+
+    void runStartupChecks()
+
+    return () => {
+      cancelled = true
+    }
+  }, [isElectron, checkAppUpdateResult, checkDuplicateInstallations])
+
+  useEffect(() => {
+    if (!isElectron || !onDuplicateInstallationsRemoved) return undefined
+
+    return onDuplicateInstallationsRemoved((result) => {
+      setRemovingDuplicate(false)
+      setDuplicateRemovalResult(result || { ok: false })
+    })
+  }, [isElectron, onDuplicateInstallationsRemoved])
+
   useEffect(() => {
     if (!isElectron || !onAppUpdateProgress) return undefined
 
@@ -358,6 +405,25 @@ export const AppUpdateProvider = ({ children }) => {
     }
   }
 
+  const handleRemoveDuplicate = async () => {
+    setRemovingDuplicate(true)
+    setDuplicateRemovalResult(null)
+
+    const started = await removeDuplicateInstallations?.()
+    if (!started) {
+      setRemovingDuplicate(false)
+      setDuplicateRemovalResult({
+        ok: false,
+        error: 'Failed to start removing the duplicate installation.'
+      })
+    }
+  }
+
+  const closeDuplicatePrompt = () => {
+    setDuplicatePromptOpen(false)
+    setDuplicateRemovalResult(null)
+  }
+
   const updateModalOpen = Boolean(updatePromptOpen || installingUpdate)
   const updateModalBusy =
     Boolean(installingUpdate) && updateProgress?.phase !== 'error'
@@ -438,6 +504,100 @@ export const AppUpdateProvider = ({ children }) => {
           />
         )}
       </Modal>
+      <Modal
+        title={
+          <Flex align='center' gap='middle'>
+            <SoftwareUpdateIcon style={{ fontSize: 18 }} />
+            Update Installed
+          </Flex>
+        }
+        open={Boolean(completedUpdate)}
+        style={{ maxWidth: 430 }}
+        centered
+        onCancel={() => setCompletedUpdate(null)}
+        footer={[
+          <Button
+            key='ok'
+            type='primary'
+            onClick={() => setCompletedUpdate(null)}
+          >
+            OK
+          </Button>
+        ]}
+      >
+        <Text>
+          Farm Control was successfully updated to version{' '}
+          {completedUpdate?.current?.version || appVersion}
+          {completedUpdate?.previous?.version &&
+          completedUpdate.previous.version !== completedUpdate?.current?.version
+            ? ` (previously ${completedUpdate.previous.version})`
+            : ''}
+          .
+        </Text>
+      </Modal>
+      <Modal
+        title='Duplicate Installation Found'
+        open={Boolean(
+          duplicatePromptOpen && duplicateInstall && !completedUpdate
+        )}
+        style={{ maxWidth: 480 }}
+        centered
+        closable={!removingDuplicate}
+        maskClosable={false}
+        onCancel={removingDuplicate ? undefined : closeDuplicatePrompt}
+        footer={
+          removingDuplicate
+            ? null
+            : duplicateRemovalResult
+              ? [
+                  <Button
+                    key='close'
+                    type='primary'
+                    onClick={closeDuplicatePrompt}
+                  >
+                    OK
+                  </Button>
+                ]
+              : [
+                  <Button key='no' onClick={closeDuplicatePrompt}>
+                    No
+                  </Button>,
+                  <Button
+                    key='yes'
+                    type='primary'
+                    onClick={handleRemoveDuplicate}
+                  >
+                    Yes
+                  </Button>
+                ]
+        }
+      >
+        {removingDuplicate ? (
+          <Space size='middle'>
+            <LoadingOutlined />
+            <Text>
+              Removing the duplicate installation... You may be asked for an
+              administrator password.
+            </Text>
+          </Space>
+        ) : duplicateRemovalResult ? (
+          <Text>
+            {duplicateRemovalResult.ok
+              ? 'The duplicate installation was removed.'
+              : duplicateRemovalResult.error ||
+                'Failed to remove the duplicate installation.'}
+          </Text>
+        ) : (
+          <Space direction='vertical' size='small'>
+            <Text>
+              Farm Control is now installed in your user applications folder,
+              but an older copy is still installed at:
+            </Text>
+            <Text code>{duplicateInstall?.duplicatePath}</Text>
+            <Text>Do you want to remove the duplicate installation?</Text>
+          </Space>
+        )}
+      </Modal>
     </AppUpdateContext.Provider>
   )
 }
diff --git a/src/components/Dashboard/context/ElectronContext.jsx b/src/components/Dashboard/context/ElectronContext.jsx
index 0e3b6eb..8f444a2 100644
--- a/src/components/Dashboard/context/ElectronContext.jsx
+++ b/src/components/Dashboard/context/ElectronContext.jsx
@@ -296,6 +296,36 @@ const ElectronProvider = ({ children }) => {
     [electronAvailable, useElectrobun]
   )
 
+  const checkAppUpdateResult = useCallback(async () => {
+    if (!electronAvailable || !useElectrobun) return null
+    return await desktopBridge.checkAppUpdateResult()
+  }, [electronAvailable, useElectrobun])
+
+  const checkDuplicateInstallations = useCallback(async () => {
+    if (!electronAvailable || !useElectrobun) return null
+    return await desktopBridge.checkDuplicateInstallations()
+  }, [electronAvailable, useElectrobun])
+
+  const removeDuplicateInstallations = useCallback(async () => {
+    if (!electronAvailable || !useElectrobun) return false
+    const result = await desktopBridge.removeDuplicateInstallations()
+    return result?.ok ?? false
+  }, [electronAvailable, useElectrobun])
+
+  const onDuplicateInstallationsRemoved = useCallback(
+    (handler) => {
+      if (
+        !electronAvailable ||
+        !useElectrobun ||
+        typeof handler !== 'function'
+      ) {
+        return () => {}
+      }
+      return desktopBridge.onMessage('duplicateInstallationsRemoved', handler)
+    },
+    [electronAvailable, useElectrobun]
+  )
+
   const onAppUpdateProgress = useCallback(
     (handler) => {
       if (!electronAvailable || typeof handler !== 'function') {
@@ -419,6 +449,10 @@ const ElectronProvider = ({ children }) => {
         getAppSettings,
         setAppSettings,
         startAppUpdate,
+        checkAppUpdateResult,
+        checkDuplicateInstallations,
+        removeDuplicateInstallations,
+        onDuplicateInstallationsRemoved,
         onAppUpdateProgress,
         onCheckForUpdatesRequest,
         getToken,
diff --git a/src/desktop/appupdate.js b/src/desktop/appupdate.js
index ca3790c..24f2b08 100644
--- a/src/desktop/appupdate.js
+++ b/src/desktop/appupdate.js
@@ -212,6 +212,69 @@ const downloadArtifact = async (artifact, destinationPath, sendProgress) => {
   });
 };
 
+const getRunningEngine = (mainWindow) =>
+  mainWindow?.renderer === "cef" ? "chromium" : "native";
+
+const getRunningAppState = (mainWindow, settings) => ({
+  version: process.env.ELECTROBUN_VERSION || null,
+  branch: settings?.appUpdateRunningBranch || null,
+  engine: getRunningEngine(mainWindow),
+});
+
+// Snapshot the running version/branch/engine so the next launch can tell
+// whether an update actually completed.
+const persistCurrentAppState = async (mainWindow) => {
+  try {
+    const settings = await getAppSettings();
+    await setAppSettings({
+      ...settings,
+      current: getRunningAppState(mainWindow, settings),
+    });
+  } catch (error) {
+    console.warn("[app-update] Failed to persist current app state.", error);
+  }
+};
+
+// Ignore missing values: a field only counts as changed when it was recorded
+// both before and after the update.
+const stateValueChanged = (previous, next) =>
+  Boolean(previous) && Boolean(next) && previous !== next;
+
+let completedUpdateResult = null;
+
+export const checkForCompletedUpdate = async (mainWindow) => {
+  // Cache per process so repeated renderer calls (e.g. remounts) get the same
+  // answer instead of a false negative after `current` has been rewritten.
+  if (completedUpdateResult) return completedUpdateResult;
+
+  try {
+    const settings = await getAppSettings();
+    const previous =
+      settings?.current && typeof settings.current === "object"
+        ? settings.current
+        : null;
+    const current = getRunningAppState(mainWindow, settings);
+
+    await setAppSettings({ ...settings, current });
+
+    const updated =
+      Boolean(previous) &&
+      (stateValueChanged(previous.version, current.version) ||
+        stateValueChanged(previous.branch, current.branch) ||
+        stateValueChanged(
+          normalizeEngine(previous.engine),
+          normalizeEngine(current.engine),
+        ));
+
+    completedUpdateResult = { updated, previous, current };
+  } catch (error) {
+    console.warn("[app-update] Failed to check for a completed update.", error);
+    completedUpdateResult = { updated: false, previous: null, current: null };
+  }
+
+  return completedUpdateResult;
+};
+
 const persistInstalledUpdateSettings = async (update) => {
   try {
     const settings = await getAppSettings();
@@ -273,6 +336,8 @@ const launchInstallerAndRestart = async (
 };
 
 const runAppUpdate = async (mainWindow, update, sendProgress) => {
+  await persistCurrentAppState(mainWindow);
+
   const artifact = selectUpdateArtifact(update);
   const tempDirectory = await fs.mkdtemp(
     path.join(os.tmpdir(), "farmcontrol-update-"),
diff --git a/src/desktop/check-duplicate-installations.js b/src/desktop/check-duplicate-installations.js
new file mode 100644
index 0000000..31cf1cd
--- /dev/null
+++ b/src/desktop/check-duplicate-installations.js
@@ -0,0 +1,294 @@
+import { execSync, spawn } from 'node:child_process'
+import { existsSync } from 'node:fs'
+import { unlink, writeFile } from 'node:fs/promises'
+import os from 'node:os'
+import path from 'node:path'
+import process from 'node:process'
+import sudo from '@vscode/sudo-prompt'
+import { findMacAppBundle } from './updater-runner.js'
+
+const MAC_APP_NAME = 'Farm Control.app'
+const MAC_SYSTEM_APP_PATH = path.join('/Applications', MAC_APP_NAME)
+const MAC_PKG_IDENTIFIER = 'com.tombutcher.farmcontrol'
+
+const WINDOWS_APP_DIR_NAME = 'Farm Control'
+const WINDOWS_LAUNCHER_EXE = 'FarmControl.exe'
+const WINDOWS_LEGACY_LAUNCHER_EXE = 'launcher.exe'
+const WINDOWS_REGISTRY_APP_KEY = 'Software\\Tom Butcher\\Farm Control'
+const WINDOWS_REGISTRY_UNINSTALL_KEY =
+  'Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Farm Control'
+
+const UNSUPPORTED_RESULT = {
+  supported: false,
+  runningInstall: 'unknown',
+  runningPath: null,
+  duplicatePath: null,
+}
+
+const quoteShellArg = (value) => `'${String(value).replaceAll("'", "'\\''")}'`
+
+const isPathInside = (childPath, parentPath) => {
+  if (!childPath || !parentPath) return false
+  const relative = path.relative(parentPath, childPath)
+  return (
+    relative === '' ||
+    (!relative.startsWith('..') && !path.isAbsolute(relative))
+  )
+}
+
+const samePath = (left, right) => {
+  if (!left || !right) return false
+  if (process.platform === 'win32') {
+    return path.resolve(left).toLowerCase() === path.resolve(right).toLowerCase()
+  }
+  return path.resolve(left) === path.resolve(right)
+}
+
+const checkMacInstallations = () => {
+  const runningBundle = findMacAppBundle(process.execPath)
+  const userAppPath = path.join(os.homedir(), 'Applications', MAC_APP_NAME)
+
+  let runningInstall = 'unknown'
+  if (runningBundle) {
+    if (isPathInside(runningBundle, path.join(os.homedir(), 'Applications'))) {
+      runningInstall = 'user'
+    } else if (isPathInside(runningBundle, '/Applications')) {
+      runningInstall = 'system'
+    }
+  }
+
+  const systemCopyExists =
+    existsSync(MAC_SYSTEM_APP_PATH) &&
+    !samePath(runningBundle, MAC_SYSTEM_APP_PATH)
+
+  return {
+    supported: true,
+    runningInstall,
+    runningPath: runningBundle,
+    userPath: userAppPath,
+    duplicatePath:
+      runningInstall === 'user' && systemCopyExists
+        ? MAC_SYSTEM_APP_PATH
+        : null,
+  }
+}
+
+const readWindowsInstallDir = (hive) => {
+  try {
+    const output = execSync(
+      `reg query "${hive}\\${WINDOWS_REGISTRY_APP_KEY}" /v InstallDir`,
+      { encoding: 'utf8', windowsHide: true },
+    )
+    const match = output.match(/InstallDir\s+REG_\w+\s+(.+)/i)
+    return match?.[1]?.trim() || null
+  } catch {
+    return null
+  }
+}
+
+const windowsDirLooksLikeInstall = (dir) =>
+  Boolean(dir) &&
+  (existsSync(path.join(dir, 'bin', WINDOWS_LAUNCHER_EXE)) ||
+    existsSync(path.join(dir, 'bin', WINDOWS_LEGACY_LAUNCHER_EXE)) ||
+    existsSync(path.join(dir, WINDOWS_LAUNCHER_EXE)) ||
+    existsSync(path.join(dir, 'Uninstall.exe')) ||
+    existsSync(path.join(dir, `Uninstall ${WINDOWS_APP_DIR_NAME}.exe`)))
+
+const getWindowsUserInstallDir = () =>
+  readWindowsInstallDir('HKCU') ||
+  path.join(
+    process.env.LOCALAPPDATA || path.join(os.homedir(), 'AppData', 'Local'),
+    'Programs',
+    WINDOWS_APP_DIR_NAME,
+  )
+
+const getWindowsSystemInstallCandidates = () => {
+  const candidates = [
+    readWindowsInstallDir('HKLM'),
+    process.env.ProgramFiles &&
+      path.join(process.env.ProgramFiles, WINDOWS_APP_DIR_NAME),
+    process.env['ProgramFiles(x86)'] &&
+      path.join(process.env['ProgramFiles(x86)'], WINDOWS_APP_DIR_NAME),
+    process.env.ProgramW6432 &&
+      path.join(process.env.ProgramW6432, WINDOWS_APP_DIR_NAME),
+  ].filter(Boolean)
+
+  const unique = []
+  for (const candidate of candidates) {
+    if (!unique.some((existing) => samePath(existing, candidate))) {
+      unique.push(candidate)
+    }
+  }
+  return unique
+}
+
+const checkWindowsInstallations = () => {
+  const runningDir = path.dirname(process.execPath)
+  const userInstallDir = getWindowsUserInstallDir()
+  const systemCandidates = getWindowsSystemInstallCandidates()
+  const localAppData =
+    process.env.LOCALAPPDATA || path.join(os.homedir(), 'AppData', 'Local')
+
+  let runningInstall = 'unknown'
+  if (
+    isPathInside(runningDir, userInstallDir) ||
+    isPathInside(runningDir, localAppData)
+  ) {
+    runningInstall = 'user'
+  } else if (
+    systemCandidates.some((candidate) => isPathInside(runningDir, candidate))
+  ) {
+    runningInstall = 'system'
+  }
+
+  const duplicatePath =
+    runningInstall === 'user'
+      ? systemCandidates.find(
+          (candidate) =>
+            windowsDirLooksLikeInstall(candidate) &&
+            !isPathInside(runningDir, candidate),
+        ) || null
+      : null
+
+  return {
+    supported: true,
+    runningInstall,
+    runningPath: runningDir,
+    userPath: userInstallDir,
+    duplicatePath,
+  }
+}
+
+export const checkForDuplicateInstallations = () => {
+  try {
+    if (process.platform === 'darwin') return checkMacInstallations()
+    if (process.platform === 'win32') return checkWindowsInstallations()
+  } catch (error) {
+    console.warn(
+      '[duplicate-install] Failed to check for duplicate installations.',
+      error,
+    )
+  }
+  return UNSUPPORTED_RESULT
+}
+
+const removeMacDuplicate = (duplicatePath) =>
+  new Promise((resolve, reject) => {
+    // Removing from /Applications typically needs admin rights; also forget
+    // the pkg receipt so future installer runs start clean.
+    const script = [
+      `/bin/rm -rf ${quoteShellArg(duplicatePath)}`,
+      `/usr/sbin/pkgutil --forget ${quoteShellArg(MAC_PKG_IDENTIFIER)} || true`,
+    ].join(' && ')
+
+    sudo.exec(script, { name: 'farmcontrol' }, (error, stdout, stderr) => {
+      if (error) {
+        const combined = `${stderr || ''}\n${error?.message || ''}`
+        const message =
+          /cancel/i.test(combined) || /did not grant permission/i.test(combined)
+            ? 'Removal was cancelled.'
+            : 'Failed to remove the duplicate installation.'
+        reject(new Error(message))
+        return
+      }
+      resolve()
+    })
+  })
+
+const psQuote = (value) => `'${String(value).replaceAll("'", "''")}'`
+
+// Intentionally does NOT run the old install's Uninstall.exe: it taskkills
+// FarmControl.exe, which would terminate the running app. Instead the old
+// files, HKLM registry keys and machine-level shortcuts are removed directly.
+const buildWindowsRemovalScript = (duplicatePath) =>
+  [
+    `$ErrorActionPreference = 'SilentlyContinue'`,
+    `$installDir = ${psQuote(duplicatePath)}`,
+    `if (Test-Path -LiteralPath $installDir) {`,
+    `  Remove-Item -LiteralPath $installDir -Recurse -Force`,
+    `}`,
+    `& reg.exe delete ${psQuote(`HKLM\\${WINDOWS_REGISTRY_APP_KEY}`)} /f 2>$null | Out-Null`,
+    `& reg.exe delete ${psQuote(`HKLM\\${WINDOWS_REGISTRY_UNINSTALL_KEY}`)} /f 2>$null | Out-Null`,
+    `$commonStartMenu = Join-Path $env:ProgramData 'Microsoft\\Windows\\Start Menu\\Programs\\${WINDOWS_APP_DIR_NAME}'`,
+    `if (Test-Path -LiteralPath $commonStartMenu) {`,
+    `  Remove-Item -LiteralPath $commonStartMenu -Recurse -Force`,
+    `}`,
+    `$publicDesktopShortcut = 'C:\\Users\\Public\\Desktop\\${WINDOWS_APP_DIR_NAME}.lnk'`,
+    `if (Test-Path -LiteralPath $publicDesktopShortcut) {`,
+    `  Remove-Item -LiteralPath $publicDesktopShortcut -Force`,
+    `}`,
+    `if (Test-Path -LiteralPath $installDir) { exit 1 }`,
+    `exit 0`,
+  ].join('\r\n')
+
+const removeWindowsDuplicate = async (duplicatePath) => {
+  const scriptPath = path.join(
+    os.tmpdir(),
+    `farmcontrol-remove-duplicate-${Date.now()}.ps1`,
+  )
+  await writeFile(scriptPath, buildWindowsRemovalScript(duplicatePath), 'utf8')
+
+  // Pre-quote the -File argument: PowerShell 5.1's Start-Process does not
+  // quote ArgumentList entries containing spaces.
+  const elevateCommand = [
+    `$p = Start-Process -FilePath 'powershell.exe'`,
+    `-ArgumentList @('-NoProfile','-ExecutionPolicy','Bypass','-File','"${scriptPath.replaceAll("'", "''")}"')`,
+    `-Verb RunAs -Wait -PassThru; exit $p.ExitCode`,
+  ].join(' ')
+
+  try {
+    await new Promise((resolve, reject) => {
+      const child = spawn(
+        'powershell.exe',
+        ['-NoProfile', '-ExecutionPolicy', 'Bypass', '-Command', elevateCommand],
+        { stdio: 'ignore', windowsHide: true },
+      )
+
+      child.on('error', reject)
+      child.on('exit', (code) => {
+        if (code === 0) {
+          resolve()
+          return
+        }
+        // Start-Process throws when the UAC prompt is declined, which exits
+        // the outer PowerShell with a non-zero code and no script output.
+        reject(
+          new Error(
+            code === 1
+              ? 'Failed to remove the duplicate installation.'
+              : 'Removal was cancelled.',
+          ),
+        )
+      })
+    })
+  } finally {
+    await unlink(scriptPath).catch(() => {})
+  }
+}
+
+export const removeDuplicateInstallations = async () => {
+  // Re-detect instead of trusting a path from the renderer so this can never
+  // be used to delete an arbitrary directory.
+  const check = checkForDuplicateInstallations()
+
+  if (!check.duplicatePath) {
+    return { ok: false, error: 'No duplicate installation was found.' }
+  }
+
+  try {
+    if (process.platform === 'darwin') {
+      await removeMacDuplicate(check.duplicatePath)
+    } else if (process.platform === 'win32') {
+      await removeWindowsDuplicate(check.duplicatePath)
+    } else {
+      return { ok: false, error: 'Not supported on this platform.' }
+    }
+  } catch (error) {
+    return {
+      ok: false,
+      error: error?.message || 'Failed to remove the duplicate installation.',
+    }
+  }
+
+  return { ok: true, removedPath: check.duplicatePath }
+}
diff --git a/src/desktop/rpc.js b/src/desktop/rpc.js
index bc191f8..0b6bbdf 100644
--- a/src/desktop/rpc.js
+++ b/src/desktop/rpc.js
@@ -1,5 +1,9 @@
 import { BrowserView } from 'electrobun/bun'
-import { startAppUpdate } from './appupdate.js'
+import { checkForCompletedUpdate, startAppUpdate } from './appupdate.js'
+import {
+  checkForDuplicateInstallations,
+  removeDuplicateInstallations
+} from './check-duplicate-installations.js'
 import { setSidebarViewMenu } from './menu.js'
 import { sendToRenderer } from './notify.js'
 import { resizeSpotlightWindow } from './spotlight.js'
@@ -72,6 +76,24 @@ export function createAppRpc() {
         setSidebarViewMenu: async ({ sections }) => ({
           ok: setSidebarViewMenu(sections)
         }),
+        checkAppUpdateResult: async () =>
+          checkForCompletedUpdate(getMainWindow()),
+        checkDuplicateInstallations: async () =>
+          checkForDuplicateInstallations(),
+        removeDuplicateInstallations: async () => {
+          // Removal waits on an admin/UAC prompt which can outlive the RPC
+          // timeout; report the outcome via a push message instead.
+          void removeDuplicateInstallations()
+            .catch((error) => ({
+              ok: false,
+              error:
+                error?.message || 'Failed to remove the duplicate installation.'
+            }))
+            .then((result) => {
+              sendToRenderer('duplicateInstallationsRemoved', result)
+            })
+          return { ok: true }
+        },
         getAppVersion: async () => process.env.ELECTROBUN_VERSION || 'desktop',
         getAppEngine: async () => {
           const mainWindow = getMainWindow()
diff --git a/src/desktop/updater-runner.js b/src/desktop/updater-runner.js
index 8578db1..ad6cc23 100644
--- a/src/desktop/updater-runner.js
+++ b/src/desktop/updater-runner.js
@@ -23,7 +23,7 @@ const resolveExistingLauncher = (...candidates) =>
 
 const quoteBatchArg = (value) => `"${String(value).replaceAll('"', '""')}"`
 
-const findMacAppBundle = (startPath) => {
+export const findMacAppBundle = (startPath) => {
   let current = path.resolve(startPath)
 
   while (current !== path.dirname(current)) {
diff --git a/src/electrobun-bridge.js b/src/electrobun-bridge.js
index 16e7f50..ee5037c 100644
--- a/src/electrobun-bridge.js
+++ b/src/electrobun-bridge.js
@@ -181,6 +181,11 @@ const electronAPI = {
   getAppSettings: () => invokeRequest('getAppSettings'),
   setAppSettings: (settings) => invokeRequest('setAppSettings', { settings }),
   startAppUpdate: (update) => invokeRequest('startAppUpdate', { update }),
+  checkAppUpdateResult: () => invokeRequest('checkAppUpdateResult'),
+  checkDuplicateInstallations: () =>
+    invokeRequest('checkDuplicateInstallations'),
+  removeDuplicateInstallations: () =>
+    invokeRequest('removeDuplicateInstallations'),
   resizeSpotlightWindow: (height) =>
     invokeRequest('resizeSpotlightWindow', { height }),
   setSidebarViewMenu: (sections) =>