Windows desktop app
Download and run:
Forza setup Settings → HUD and Gameplay → Data Out: On · IP: 127.0.0.1 · Port: 20440 (Or whatever you have set in app)
Heads-up: Windows will ask to allow DZ-OSS network access
On first launch, Windows Defender Firewall will ask whether to allow DZ-OSS to communicate on your network. It's safe to allow DZ-OSS only uses the network for two things:
Forza telemetry: it opens a local UDP port (default 20440) to receive the game's Data Out feed. This is what the prompt is really about; block it and no telemetry comes in.
Update check: once at startup it asks GitHub whether a newer version is out (to show the "update available" banner). It sends none of your data and fails silently if you're offline.
Nothing is collected or uploaded your sessions and runs stay in a local database on your PC.
Linux / macOS, or the headless web server? Build from source npm install && npm run tauri build (add --features server for the dz-oss-serve headless binary). See Running from Source and the headless server guide.