Hongguo Downloader v1.0.0.73 — SC R2 Fixed Offline Installer

1. Extract this installer ZIP completely to a new folder.
2. Keep Setup.exe, payload.zip, and the runtime folder together.
3. Double-click Setup.exe.
4. It installs to %LOCALAPPDATA%\Programs\Hongguo Downloader.
5. Desktop and Start Menu shortcuts are created.
6. Use Windows Settings > Apps to uninstall.

This build keeps the SC R2 license system and removes the external Telegram support/report link.
It also fixes the server startup block caused by the previous mixed-engine integrity manifest.
