Old registry files can sometimes block a game from recognizing that Steam is active. Close Steam.
This process will check for any corrupted game files and download any missing files. Old registry files can sometimes block a game
How to Fix “Steam Must Be Running to Play This Game” (2026 Quick Fix) Old registry files can sometimes block a game
DmC Devil May Cry : "Steam Must Be Running to Play This Game" Fix Guide Old registry files can sometimes block a game
To fix the "Steam must be running to play this game" DmC: Devil May Cry