It means the decompression process failed because the data written to disk doesn't match the expected CRC . In plain English: Your RAM, storage, or CPU delivered corrupt data to the installer.
Error -11 is frustrating but fixable. Work through the list above before giving up. Reddit's consensus (r/PiratedGames wiki) confirms it's almost always local hardware or permissions, not the repack itself. unarc dll returned an error code 11 reddit
Review / Troubleshooting Guide:
⭐⭐⭐⭐ (4/5) – Annoying but solvable. It means the decompression process failed because the
If you landed here from Google or Reddit while trying to install a repack (FitGirl, Dodi, etc.) and saw "Unarc.dll returned an error code -11" , don't panic. unarc dll returned an error code 11 reddit