The "Steam must be running to play this game" error in typically occurs because the game's executable cannot establish a handshake with the Steam client, often due to permission issues, corrupted cache files, or firewall blocks. Troubleshooting the "Steam Must Be Running" Error
Old configuration data can cause launch errors. Refreshing these files can force Steam to re-authenticate the game. entirely. Press Win + R , type %localappdata% , and press Enter. The "Steam must be running to play this
Go to and click Verify integrity of game files . 3. Clear Steam's Local Cache often due to permission issues