Make sure you are using a clean install of the game files. If the files were downloaded from an outside source, they might require a specific "crack" or manifest that your current GreenLuma setup doesn't have yet.
: Steam requires .acf (AppManifest) files to recognize that a game is "installed" and ready to be decrypted. greenluma content still encrypted work
The "Content still encrypted" error serves as a reminder of the boundary between license spoofing data decryption Make sure you are using a clean install of the game files
Troubleshooting Steam: Why "Content Still Encrypted" Happens with GreenLuma greenluma content still encrypted work