Before diving into more complex troubleshooting, try these quick checks that often solve the problem instantly.
In Windows, Standard User privileges often block the communication between the Steam Client and the Game executable. Resident Evil 4 needs permission to "talk" to Steam. Before diving into more complex troubleshooting, try these
How to Fix “Steam Must Be Running to Play This Game” (2026 Quick Fix) Before diving into more complex troubleshooting
A corrupted download cache is the most common cause of the "Steam must be running" error. Steam keeps a temporary log of license checks; when this log gets corrupted, the game thinks the license is missing. when this log gets corrupted
Open Steam and go to your .
: Click on the Installed Files tab (or Local Files on older Steam versions).