Click the next to your drive and select Repair Library . Address Anti-Virus Blocks :
Click to automatically replace corrupted or missing data. Repair the Steam Library : Go to Steam Settings > Storage . forts-fix-repair-steam-generic-rar
Commonly, the Forts.exe or specific .dll files are flagged as false positives. Adding the game folder to your anti-virus whitelist often fixes "access denied" or launch errors. For those using an "Online Fix": Click the next to your drive and select Repair Library
: Usually involves running the Steam client in the background and launching the game via the Forts.exe included in the fix. forts-fix-repair-steam-generic-rar