"PA" often stands for specific game titles (such as Planet Alpha , Phantom Abyss , or Public Accomplice ) or specific scene groups. The "Fix-Repair" tag usually implies an online fix that allows pirated games to connect to Steam servers for multiplayer functionality.
If Steam is having trouble reading your hard drive or solid-state drive, repairing the library folder can reset system permissions. Go to Steam -> Storage . Select the drive where your game is installed. Click the three dots (...) next to the storage bar. Select Repair Folder . What to Do If You Already Downloaded the File PA-Fix-Repair-Steam.rar