How to Fix “Steam Must Be Running to Play This Game” (2026 Quick Fix)
: Some users found that antivirus software blocked the game's initial handshake with Steam. Try disabling your antivirus or adding the game folder to its "ignore" or "exclusion" list before launching. How to Fix “Steam Must Be Running to
This forces Steam to re-authenticate the game. The "Steam must be running to play this
The "Steam must be running to play this game" error in typically occurs when the game's executable fails to communicate with the Steam client, often due to permission issues, corrupted cache files, or security software interference. Top Fixes for "Steam Must Be Running" 1. Run Steam and DmC as Administrator The native version is the primary culprit for
This game has a native Linux port, but it is broken. The native version is the primary culprit for the "Steam must be running" error because it uses an outdated Steam API. The solution?
Navigate to your Steam installation folder (usually C:\Program Files (x86)\Steam ). Find and delete the file named ClientRegistry.blob . Restart Steam; it will automatically recreate the file. 4. Check Antivirus and Firewall Exceptions
Check and select Windows 7 or Windows 8 . 5. Disable Antivirus and Overlays