diff --git a/apps/ai-game-creator-shell/src-tauri/src/main.rs b/apps/ai-game-creator-shell/src-tauri/src/main.rs
index 8610ef687..8cccbcefd 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/main.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/main.rs
@@ -57,6 +57,45 @@ struct AgcUpdateDownloadProgress {
     total_bytes: Option<u64>,
 }
 
+#[cfg(windows)]
+fn launch_agc_installer(path: &Path) -> Result<(), String> {
+    use std::os::windows::process::CommandExt;
+
+    let executable = path.to_string_lossy().replace('\'', "''");
+    let script = format!(
+        "$ErrorActionPreference = 'Stop'; Start-Process -Verb RunAs -FilePath '{executable}' -ArgumentList @('/S')"
+    );
+    let status = Command::new("powershell.exe")
+        .args([
+            "-NoProfile",
+            "-NonInteractive",
+            "-WindowStyle",
+            "Hidden",
+            "-Command",
+            script.as_str(),
+        ])
+        .creation_flags(0x0800_0000)
+        .status()
+        .map_err(|error| format!("无法启动更新安装程序：{error}"))?;
+    if status.success() {
+        Ok(())
+    } else {
+        Err(format!(
+            "无法启动更新安装程序（exit code {:?}）",
+            status.code()
+        ))
+    }
+}
+
+#[cfg(not(windows))]
+fn launch_agc_installer(path: &Path) -> Result<(), String> {
+    Command::new(path)
+        .arg("/S")
+        .spawn()
+        .map(|_| ())
+        .map_err(|error| format!("无法启动更新安装程序：{error}"))
+}
+
 #[tauri::command]
 async fn download_agc_update(
     app: tauri::AppHandle,
@@ -154,6 +193,7 @@ async fn download_agc_update(
         let _ = fs::remove_file(&temporary);
         return Err("保存更新文件失败".to_string());
     }
+    drop(file);
     if let Some(expected_size) = expected_size {
         if downloaded_bytes != expected_size {
             let _ = fs::remove_file(&temporary);
@@ -181,10 +221,7 @@ async fn download_agc_update(
         let _ = fs::remove_file(&temporary);
         return Err(format!("提交更新文件失败：{error}"));
     }
-    Command::new(&target)
-        .arg("/S")
-        .spawn()
-        .map_err(|_| "无法启动更新安装程序".to_string())?;
+    launch_agc_installer(&target)?;
     app.exit(0);
     Ok(target.to_string_lossy().into_owned())
 }
diff --git a/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md b/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md
index 7c3e3cebd..0221e9304 100644
--- a/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md
+++ b/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md
@@ -19,7 +19,7 @@ AGC 每次启动时由根窗口检查一次公开 OSS 更新清单。清单默
 }
 ```
 
-`downloadUrl` 必须是 HTTPS；如提供 `sha256` / `size`，Tauri 下载时会校验摘要和字节数。点击“下载更新”后，客户端将安装包流式写入系统临时目录并显示进度，校验成功后自动启动 NSIS 静默安装并退出旧客户端。
+`downloadUrl` 必须是 HTTPS；如提供 `sha256` / `size`，Tauri 下载时会校验摘要和字节数。点击“下载更新”后，客户端将安装包流式写入系统临时目录并显示进度，校验成功后通过 Windows UAC 提权启动 NSIS 静默安装并退出旧客户端。
 
 ## 启动与失败策略