diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 18b0b628..d31c3d50 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1709,6 +1709,7 @@ function App() {
       lastUpdateInfo,
       markUpdateProgressDismissed,
       muteLatestUpdate,
+      openDownloadedUpdateDirectory,
       setIsAboutOpen,
       showUpdateDownloadProgress,
       updateChannel,
@@ -4972,7 +4973,12 @@ function App() {
                 <Button key="check" icon={<CloudDownloadOutlined />} onClick={() => checkForUpdates(false)}>{t('app.about.action.check_updates')}</Button>,
                 <Button key="close" onClick={() => setIsAboutOpen(false)}>{t('common.close')}</Button>,
                 lastUpdateInfo?.hasUpdate && !isLatestUpdateDownloaded && !isBackgroundProgressForLatestUpdate ? (
-                    <Button key="download" type="primary" icon={<DownloadOutlined />} onClick={() => downloadUpdate(lastUpdateInfo, false)}>{t('app.about.action.download_update')}</Button>
+                <Button key="download" type="primary" icon={<DownloadOutlined />} onClick={() => downloadUpdate(lastUpdateInfo, false)}>{t('app.about.action.download_update')}</Button>
+                ) : null,
+                isLatestUpdateDownloaded ? (
+                    <Button key="open-install-directory" onClick={openDownloadedUpdateDirectory}>
+                        {t('app.about.action.open_install_directory')}
+                    </Button>
                 ) : null,
                 isLatestUpdateDownloaded ? (
                     <Button key="install-direct" type="primary" icon={<DownloadOutlined />} onClick={handleInstallFromProgress}>
@@ -6006,6 +6012,9 @@ function App() {
                   </Button>
               ] : (updateDownloadProgress.status === 'done' ? [
                   <Button key="close" onClick={hideUpdateDownloadProgress}>{t('common.close')}</Button>,
+                  <Button key="open-install-directory" onClick={openDownloadedUpdateDirectory}>
+                      {t('app.about.action.open_install_directory')}
+                  </Button>,
                   <Button key="install" type="primary" onClick={handleInstallFromProgress}>
                       {t('app.about.action.install_update')}
                   </Button>
diff --git a/frontend/src/hooks/useAppUpdateManager.test.tsx b/frontend/src/hooks/useAppUpdateManager.test.tsx
index 1e17185c..6146a5da 100644
--- a/frontend/src/hooks/useAppUpdateManager.test.tsx
+++ b/frontend/src/hooks/useAppUpdateManager.test.tsx
@@ -183,4 +183,34 @@ describe('useAppUpdateManager', () => {
     expect(hook?.updateChannel).toBe('dev');
     expect(hook?.lastUpdateInfo?.channel).toBe('dev');
   });
+
+  it('opens the downloaded update directory when a package is already downloaded', async () => {
+    backendApp.CheckForUpdates.mockResolvedValue({
+      success: true,
+      data: {
+        hasUpdate: true,
+        currentVersion: '0.8.1',
+        latestVersion: '0.8.2',
+        downloaded: true,
+        assetSize: 1024,
+      },
+    });
+    backendApp.OpenDownloadedUpdateDirectory.mockResolvedValue({
+      success: true,
+      message: 'opened-install-directory',
+    });
+
+    renderHook();
+
+    await act(async () => {
+      await hook?.checkForUpdates(false);
+    });
+
+    await act(async () => {
+      await hook?.openDownloadedUpdateDirectory();
+    });
+
+    expect(backendApp.OpenDownloadedUpdateDirectory).toHaveBeenCalledTimes(1);
+    expect(messageApi.success).toHaveBeenCalledWith('opened-install-directory');
+  });
 });
diff --git a/frontend/src/hooks/useAppUpdateManager.ts b/frontend/src/hooks/useAppUpdateManager.ts
index c09d4bbd..6880d498 100644
--- a/frontend/src/hooks/useAppUpdateManager.ts
+++ b/frontend/src/hooks/useAppUpdateManager.ts
@@ -242,6 +242,20 @@ export const useAppUpdateManager = ({
     hideUpdateDownloadProgress();
   }, [hideUpdateDownloadProgress, lastUpdateInfo, lastUpdateKey, t, updateDownloadProgress.status]);
 
+  const openDownloadedUpdateDirectory = useCallback(async () => {
+    const backendApp = (window as any).go?.app?.App;
+    if (typeof backendApp?.OpenDownloadedUpdateDirectory !== 'function') {
+      void message.error(t('app.about.message.open_install_directory_failed_with_error', { error: t('common.unknown') }));
+      return;
+    }
+    const res = await backendApp.OpenDownloadedUpdateDirectory();
+    if (!res?.success) {
+      void message.error(t('app.about.message.open_install_directory_failed_with_error', { error: res?.message || t('common.unknown') }));
+      return;
+    }
+    void message.success(res?.message || t('app.about.message.install_directory_opened_manual_replace'));
+  }, [t]);
+
   const checkForUpdates = useCallback(async (silent: boolean) => {
     if (updateCheckInFlightRef.current) return;
     updateCheckInFlightRef.current = true;
@@ -523,6 +537,7 @@ export const useAppUpdateManager = ({
     lastUpdateInfo,
     markUpdateProgressDismissed,
     muteLatestUpdate,
+    openDownloadedUpdateDirectory,
     setIsAboutOpen,
     showUpdateDownloadProgress,
     updateChannel,
diff --git a/internal/app/methods_update.go b/internal/app/methods_update.go
index 4dbe8524..0926f629 100644
--- a/internal/app/methods_update.go
+++ b/internal/app/methods_update.go
@@ -34,10 +34,12 @@ const (
 )
 
 var (
-	updateFetchLatestRelease = fetchLatestRelease
-	updateFetchDevRelease    = fetchDevRelease
-	updateFetchReleaseSHA256 = fetchReleaseSHA256
-	updateLogCheckError      = func(err error) { logger.Error(err, "检查更新失败") }
+	updateFetchLatestRelease   = fetchLatestRelease
+	updateFetchDevRelease      = fetchDevRelease
+	updateFetchReleaseSHA256   = fetchReleaseSHA256
+	updateLogCheckError        = func(err error) { logger.Error(err, "检查更新失败") }
+	updateResolveInstallTarget = resolveUpdateInstallTarget
+	updateLaunchInstallScript  = launchUpdateScript
 )
 
 type updateState struct {
@@ -244,7 +246,18 @@ func (a *App) InstallUpdateAndRestart() connection.QueryResult {
 		return connection.QueryResult{Success: false, Message: a.appText("app.update.backend.message.no_downloaded_package", nil)}
 	}
 
-	if err := launchUpdateScript(staged); err != nil {
+	if stdRuntime.GOOS == "windows" {
+		if err := ensureWindowsUpdateTargetWritable(updateResolveInstallTarget()); err != nil {
+			return connection.QueryResult{
+				Success: false,
+				Message: a.appText("app.update.backend.message.install_launch_failed", map[string]any{
+					"detail": a.localizedUpdateError(err),
+				}),
+			}
+		}
+	}
+
+	if err := updateLaunchInstallScript(staged); err != nil {
 		logger.Error(err, "启动更新脚本失败")
 		detail := a.localizedUpdateError(err)
 		msg := a.appText("app.update.backend.message.install_launch_failed", map[string]any{"detail": detail})
@@ -956,8 +969,7 @@ func resolveLegacyUpdateWorkspaceDir() string {
 }
 
 func resolveUpdateWorkspaceDir(version string) string {
-	// 默认使用系统临时目录作为更新工作区，避免目录权限与锁冲突。
-	// macOS 用户要求更新包默认保存在桌面：Desktop/GoNavi-<version>/。
+	// macOS 更新包继续保存在桌面版本目录根级，方便用户直接处理 DMG。
 	if stdRuntime.GOOS == "darwin" {
 		homeDir, err := os.UserHomeDir()
 		if err == nil && strings.TrimSpace(homeDir) != "" {
@@ -967,6 +979,16 @@ func resolveUpdateWorkspaceDir(version string) string {
 			}
 		}
 	}
+
+	// Windows / Linux 更新包优先落到当前应用运行目录，方便用户直接找到下载产物。
+	targetPath := strings.TrimSpace(updateResolveInstallTarget())
+	if targetPath != "" {
+		targetDir := strings.TrimSpace(filepath.Dir(targetPath))
+		if targetDir != "" && targetDir != "." {
+			return targetDir
+		}
+	}
+
 	return resolveLegacyUpdateWorkspaceDir()
 }
 
@@ -1094,6 +1116,33 @@ func resolveUpdateInstallTarget() string {
 	return exePath
 }
 
+func ensureWindowsUpdateTargetWritable(targetExe string) error {
+	targetExe = strings.TrimSpace(targetExe)
+	targetDir := strings.TrimSpace(filepath.Dir(targetExe))
+	if targetExe == "" || targetDir == "" || targetDir == "." {
+		return localizedUpdateError{key: "app.update.backend.error.install_target_unresolved"}
+	}
+
+	probePath := filepath.Join(targetDir, fmt.Sprintf(".gonavi-update-write-probe-%d.tmp", time.Now().UnixNano()))
+	file, err := os.OpenFile(probePath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o600)
+	if err != nil {
+		return localizedUpdateError{
+			key: "app.update.backend.error.install_target_not_writable",
+			params: map[string]any{
+				"path":   targetDir,
+				"detail": err.Error(),
+			},
+		}
+	}
+	if closeErr := file.Close(); closeErr != nil {
+		logger.Warnf("关闭 Windows 更新写入探针失败：%v", closeErr)
+	}
+	if removeErr := os.Remove(probePath); removeErr != nil && !errors.Is(removeErr, os.ErrNotExist) {
+		logger.Warnf("清理 Windows 更新写入探针失败：%v", removeErr)
+	}
+	return nil
+}
+
 func (a *App) emitUpdateDownloadProgress(status string, downloaded, total int64, message string) {
 	if a.ctx == nil {
 		return
diff --git a/internal/app/methods_update_test.go b/internal/app/methods_update_test.go
index 7f197f05..4e614c35 100644
--- a/internal/app/methods_update_test.go
+++ b/internal/app/methods_update_test.go
@@ -340,6 +340,87 @@ func TestDownloadUpdateUsesCurrentLanguageForBackendMessage(t *testing.T) {
 	}
 }
 
+func TestEnsureWindowsUpdateTargetWritableAcceptsWritableDirectory(t *testing.T) {
+	if stdRuntime.GOOS != "windows" {
+		t.Skip("windows-only update target validation")
+	}
+
+	target := filepath.Join(t.TempDir(), "GoNavi.exe")
+	if err := ensureWindowsUpdateTargetWritable(target); err != nil {
+		t.Fatalf("ensureWindowsUpdateTargetWritable returned error: %v", err)
+	}
+}
+
+func TestInstallUpdateAndRestartFailsBeforeLaunchWhenWindowsTargetDirIsNotWritable(t *testing.T) {
+	if stdRuntime.GOOS != "windows" {
+		t.Skip("windows-only update target validation")
+	}
+
+	stagedDir := t.TempDir()
+	assetPath := filepath.Join(stagedDir, "GoNavi-0.8.2-Windows-Amd64.exe")
+	if err := os.WriteFile(assetPath, []byte("12345678"), 0o644); err != nil {
+		t.Fatalf("WriteFile returned error: %v", err)
+	}
+
+	app := NewApp()
+	app.updateState.staged = &stagedUpdate{
+		Channel:   updateChannelLatest,
+		Version:   "0.8.2",
+		AssetName: filepath.Base(assetPath),
+		FilePath:  assetPath,
+		StagedDir: stagedDir,
+	}
+
+	originalResolveInstallTarget := updateResolveInstallTarget
+	originalLaunchInstallScript := updateLaunchInstallScript
+	t.Cleanup(func() {
+		updateResolveInstallTarget = originalResolveInstallTarget
+		updateLaunchInstallScript = originalLaunchInstallScript
+	})
+
+	updateResolveInstallTarget = func() string {
+		return filepath.Join(stagedDir, "missing", "GoNavi.exe")
+	}
+
+	launched := false
+	updateLaunchInstallScript = func(*stagedUpdate) error {
+		launched = true
+		return nil
+	}
+
+	result := app.InstallUpdateAndRestart()
+	if result.Success {
+		t.Fatalf("expected InstallUpdateAndRestart to fail, got %#v", result)
+	}
+	if launched {
+		t.Fatal("expected launch script to be skipped when install target is not writable")
+	}
+	if !strings.Contains(result.Message, "not writable") {
+		t.Fatalf("expected install target write failure in message, got %q", result.Message)
+	}
+}
+
+func TestResolveUpdateWorkspaceDirPrefersCurrentInstallDirectory(t *testing.T) {
+	if stdRuntime.GOOS == "darwin" {
+		t.Skip("macOS keeps update downloads on Desktop")
+	}
+
+	targetDir := t.TempDir()
+	originalResolveInstallTarget := updateResolveInstallTarget
+	t.Cleanup(func() {
+		updateResolveInstallTarget = originalResolveInstallTarget
+	})
+
+	updateResolveInstallTarget = func() string {
+		return filepath.Join(targetDir, "GoNavi.exe")
+	}
+
+	got := resolveUpdateWorkspaceDir("0.8.2")
+	if got != targetDir {
+		t.Fatalf("expected workspace dir %q, got %q", targetDir, got)
+	}
+}
+
 func TestExpectedAssetNameForExecutableUsesLinuxWebKit41Suffix(t *testing.T) {
 	assetName, err := expectedAssetNameForExecutable(
 		"linux",
diff --git a/shared/i18n/de-DE.json b/shared/i18n/de-DE.json
index 3a695270..09532d0b 100644
--- a/shared/i18n/de-DE.json
+++ b/shared/i18n/de-DE.json
@@ -2877,6 +2877,8 @@
   "app.update.backend.error.sha256_missing_current_package": "SHA256SUMS enthält kein Updatepaket für die aktuelle Plattform",
   "app.update.backend.error.sha256sums_download_failed": "SHA256SUMS konnte nicht heruntergeladen werden: HTTP {{status}}",
   "app.update.backend.error.sha256sums_missing": "Release stellt keine SHA256SUMS bereit",
+  "app.update.backend.error.install_target_not_writable": "Das aktuelle Installationsverzeichnis ist nicht beschreibbar: {{path}} ({{detail}})",
+  "app.update.backend.error.install_target_unresolved": "Das aktuelle Installationsverzeichnis konnte nicht ermittelt werden",
   "app.update.backend.error.update_package_not_found": "Updatepaket nicht gefunden: {{name}}",
   "app.update.backend.message.app_directory_unavailable": "Auf das App-Verzeichnis kann nicht zugegriffen werden: {{path}}",
   "app.update.backend.message.app_directory_unresolved_download": "Das aktuelle App-Verzeichnis kann nicht bestimmt werden, daher kann das Update nicht heruntergeladen werden",
diff --git a/shared/i18n/en-US.json b/shared/i18n/en-US.json
index ce4b74e1..266c3df7 100644
--- a/shared/i18n/en-US.json
+++ b/shared/i18n/en-US.json
@@ -2877,6 +2877,8 @@
   "app.update.backend.error.sha256_missing_current_package": "SHA256SUMS does not include the current platform update package",
   "app.update.backend.error.sha256sums_download_failed": "Failed to download SHA256SUMS: HTTP {{status}}",
   "app.update.backend.error.sha256sums_missing": "Release did not provide SHA256SUMS",
+  "app.update.backend.error.install_target_not_writable": "The current install directory is not writable: {{path}} ({{detail}})",
+  "app.update.backend.error.install_target_unresolved": "Unable to determine the current install directory",
   "app.update.backend.error.update_package_not_found": "Update package not found: {{name}}",
   "app.update.backend.message.app_directory_unavailable": "Cannot access app directory: {{path}}",
   "app.update.backend.message.app_directory_unresolved_download": "Cannot determine the current app directory, so the update cannot be downloaded",
diff --git a/shared/i18n/ja-JP.json b/shared/i18n/ja-JP.json
index cade019b..ddbbdbb4 100644
--- a/shared/i18n/ja-JP.json
+++ b/shared/i18n/ja-JP.json
@@ -2877,6 +2877,8 @@
   "app.update.backend.error.sha256_missing_current_package": "SHA256SUMS に現在のプラットフォーム用更新パッケージが含まれていません",
   "app.update.backend.error.sha256sums_download_failed": "SHA256SUMS のダウンロードに失敗しました: HTTP {{status}}",
   "app.update.backend.error.sha256sums_missing": "Release に SHA256SUMS が提供されていません",
+  "app.update.backend.error.install_target_not_writable": "現在のインストール先ディレクトリに書き込めません: {{path}} ({{detail}})",
+  "app.update.backend.error.install_target_unresolved": "現在のインストール先ディレクトリを特定できません",
   "app.update.backend.error.update_package_not_found": "更新パッケージが見つかりません: {{name}}",
   "app.update.backend.message.app_directory_unavailable": "アプリディレクトリにアクセスできません: {{path}}",
   "app.update.backend.message.app_directory_unresolved_download": "現在のアプリディレクトリを特定できないため、更新をダウンロードできません",
diff --git a/shared/i18n/ru-RU.json b/shared/i18n/ru-RU.json
index fd666f8c..fd1fd5d6 100644
--- a/shared/i18n/ru-RU.json
+++ b/shared/i18n/ru-RU.json
@@ -2877,6 +2877,8 @@
   "app.update.backend.error.sha256_missing_current_package": "SHA256SUMS не содержит пакет обновления для текущей платформы",
   "app.update.backend.error.sha256sums_download_failed": "Не удалось скачать SHA256SUMS: HTTP {{status}}",
   "app.update.backend.error.sha256sums_missing": "Release не предоставляет SHA256SUMS",
+  "app.update.backend.error.install_target_not_writable": "Текущий каталог установки недоступен для записи: {{path}} ({{detail}})",
+  "app.update.backend.error.install_target_unresolved": "Не удалось определить текущий каталог установки",
   "app.update.backend.error.update_package_not_found": "Пакет обновления не найден: {{name}}",
   "app.update.backend.message.app_directory_unavailable": "Нет доступа к каталогу приложения: {{path}}",
   "app.update.backend.message.app_directory_unresolved_download": "Не удалось определить текущий каталог приложения, поэтому обновление нельзя скачать",
diff --git a/shared/i18n/zh-CN.json b/shared/i18n/zh-CN.json
index cd5b403c..871c5ec6 100644
--- a/shared/i18n/zh-CN.json
+++ b/shared/i18n/zh-CN.json
@@ -2877,6 +2877,8 @@
   "app.update.backend.error.sha256_missing_current_package": "SHA256SUMS 未包含当前平台更新包",
   "app.update.backend.error.sha256sums_download_failed": "下载 SHA256SUMS 失败：HTTP {{status}}",
   "app.update.backend.error.sha256sums_missing": "Release 未提供 SHA256SUMS",
+  "app.update.backend.error.install_target_not_writable": "当前安装目录不可写：{{path}}（{{detail}}）",
+  "app.update.backend.error.install_target_unresolved": "无法确定当前安装目录",
   "app.update.backend.error.update_package_not_found": "未找到更新包：{{name}}",
   "app.update.backend.message.app_directory_unavailable": "无法访问应用目录：{{path}}",
   "app.update.backend.message.app_directory_unresolved_download": "无法确定当前应用目录，无法下载更新",
diff --git a/shared/i18n/zh-TW.json b/shared/i18n/zh-TW.json
index 69af5cc2..3e226eb3 100644
--- a/shared/i18n/zh-TW.json
+++ b/shared/i18n/zh-TW.json
@@ -2877,6 +2877,8 @@
   "app.update.backend.error.sha256_missing_current_package": "SHA256SUMS 未包含目前平台更新套件",
   "app.update.backend.error.sha256sums_download_failed": "下載 SHA256SUMS 失敗：HTTP {{status}}",
   "app.update.backend.error.sha256sums_missing": "Release 未提供 SHA256SUMS",
+  "app.update.backend.error.install_target_not_writable": "目前安裝目錄不可寫：{{path}}（{{detail}}）",
+  "app.update.backend.error.install_target_unresolved": "無法確定目前安裝目錄",
   "app.update.backend.error.update_package_not_found": "未找到更新套件：{{name}}",
   "app.update.backend.message.app_directory_unavailable": "無法存取應用程式目錄：{{path}}",
   "app.update.backend.message.app_directory_unresolved_download": "無法判斷目前應用程式目錄，因此無法下載更新",