The easiest way is via the **@SurfingVpnBot** bot:

1. Tap **🚀 Подключиться** (Connect) — the mini app opens.
2. At the top choose your system (Windows / Android / iPhone / macOS).
3. Tap the download button and install the Happ build.

Or directly:

- iPhone/iPad — App Store, Happ Proxy Utility
- Android — Google Play, Happ Proxy Utility
- Windows / macOS / Linux — happ.su