Navigate to your main Steam installation folder (typically C:\Program Files (x86)\Steam ). Locate and delete the file named ClientRegistry.blob . Restart Steam and launch the game again.
Sometimes, Windows tries to run the game in "Windows 7" mode, which breaks the Steam connection. Go to the Binaries\Win32 folder in the game files. Right-click . Select Properties > Compatibility . Uncheck "Run this program in compatibility mode." Click Apply . 💡 Pro Tip
How to Fix "Steam Must Be Running to Play This Game" in DmC: Devil May Cry
It sounds like you're dealing with the error in DmC: Devil May Cry (or possibly the classic Devil May Cry 3/4 on Steam).
Sometimes, aggressive third-party antivirus software flags the game's executable file as a false positive. This blocks it from accessing network ports required to verify your Steam license.
: Navigate to your main Steam installation folder (usually C:\Program Files (x86)\Steam ). Find and delete the file named ClientRegistry.blob . Restart Steam; it will automatically update and recreate this file, often clearing the "Steam must be running" loop. Verify Integrity of Game Files : Open your Steam Library . Right-click DmC: Devil May Cry and select Properties .
Right-click the game's main .exe 0;400; file and select .
Missing or corrupt configuration files (specifically the Steam AppID file).
The error can arise from several different causes, including:
DmC Devil May Cry "Steam Must Be Running to Play This Game" Fix - Top Solutions
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Each solution targets a specific root cause of the error: