How to fix error critical-process-died in Proton (Steam Play)

Solution Steps

1. 1 Restart Proton (Steam Play) completely. Close it, open Task Manager (Ctrl+Shift+Esc), find any remaining Proton (Steam Play) processes, right-click → End Task. Background processes from previous sessions are the most common cause of startup crashes.
2. 2 Update Proton (Steam Play) to the latest version. Open the app, go to Help → Check for Updates (or download the latest installer from the official website). Updates fix known bugs and compatibility issues.
3. 3 Reset Proton (Steam Play) settings. Navigate to %APPDATA%\Proton(SteamPlay) and rename the settings folder to add '.old'. This forces Proton (Steam Play) to create fresh settings — corrupted config files cause crashes.
4. 4 Run Proton (Steam Play) as Administrator. Right-click the shortcut → Properties → Compatibility → check 'Run as Administrator'. Some features of Proton (Steam Play) require elevated permissions.
5. 5 Check if Proton (Steam Play) conflicts with your antivirus. Temporarily disable real-time protection and test. Add Proton (Steam Play) installation folder to antivirus exclusions.
6. 6 Clear Proton (Steam Play) cache. Navigate to %LOCALAPPDATA%\Proton(SteamPlay)\Cache and delete all files. Corrupted cache data causes rendering and processing errors.
7. 7 Repair Proton (Steam Play) installation. Windows Settings → Apps → Proton (Steam Play) → Modify → Repair. This replaces damaged program files while preserving your data.
8. 8 If Proton (Steam Play) still won't work: uninstall from Settings → Apps, restart, reinstall from official website. A clean install is the nuclear option but fixes almost everything.