diff --git a/apps/desktop/electron-builder.yml b/apps/desktop/electron-builder.yml
index c47282c..b4e439f 100644
--- a/apps/desktop/electron-builder.yml
+++ b/apps/desktop/electron-builder.yml
@@ -104,15 +104,15 @@ extraResources:
       - "**/*"
 
 nsis:
-  oneClick: false
+  # oneClick=false + perMachine=false 조합이 System.dll 0xc0000005 크래시 사례(#7921).
+  # 사내 테스트 단계에선 oneClick=true로 전환하여 크래시 경로 회피.
+  oneClick: true
   perMachine: false
-  allowToChangeInstallationDirectory: true
+  allowToChangeInstallationDirectory: false
   createDesktopShortcut: true
   createStartMenuShortcut: true
   shortcutName: D3RO Voice
   deleteAppDataOnUninstall: false
-  # include: build/installer.nsh
-  # NOTE: customInstall/customUnInstall 매크로가 NSIS System.dll 크래시를 유발한 사례 있어
-  # v0.1.0-alpha 단계에선 기본 electron-builder installer 사용. 안정화 후 재활성.
+  # installer.nsh 비활성화 유지 (System.dll 크래시 방지)
 
 npmRebuild: true
diff --git a/apps/desktop/scripts/download-ollama.ps1 b/apps/desktop/scripts/download-ollama.ps1
index 2544665..58e63a6 100644
--- a/apps/desktop/scripts/download-ollama.ps1
+++ b/apps/desktop/scripts/download-ollama.ps1
@@ -56,12 +56,24 @@ Expand-Archive -Path $TEMP_ZIP -DestinationPath $TEMP_DIR -Force
 
 New-Item -ItemType Directory -Force -Path $DEST_DIR | Out-Null
 
-# zip layout: ollama.exe + lib/ (DLLs). Copy everything.
+# zip layout: ollama.exe + lib/ (runners + DLLs).
+# Prune GPU runners (CUDA v11/v12, ROCm) to keep installer under NSIS 2GB limit.
+# CPU runners (cpu_avx2, cpu_avx) are sufficient for initial bundle; users needing GPU
+# can install Ollama separately or via future builds.
 Get-ChildItem -Path $TEMP_DIR -Force | ForEach-Object {
     Copy-Item $_.FullName -Destination $DEST_DIR -Recurse -Force
     Write-Host ("  copied: {0}" -f $_.Name) -ForegroundColor Green
 }
 
+# Remove heavy GPU runners to stay below NSIS size limits
+$runnersDir = Join-Path $DEST_DIR "lib\ollama\runners"
+if (Test-Path $runnersDir) {
+    Get-ChildItem $runnersDir -Directory | Where-Object { $_.Name -like "cuda*" -or $_.Name -like "rocm*" } | ForEach-Object {
+        Remove-Item -Recurse -Force $_.FullName
+        Write-Host ("  pruned GPU runner: {0}" -f $_.Name) -ForegroundColor Yellow
+    }
+}
+
 Remove-Item -Recurse -Force $TEMP_DIR -ErrorAction SilentlyContinue
 Remove-Item -Force $TEMP_ZIP -ErrorAction SilentlyContinue