Background programs can conflict.
Error -6 with unarc.dll almost always means file corruption during download.
Corrupted system files or bad disk sectors can misdirect unarc.dll, causing code -6. Background programs can conflict
Check disk for errors:
System File Checker:
After both finish, restart and try installing again.
Error code -6 with unarc.dll means the installer cannot read the compressed data correctly.
Do not blame FIFA 13 – the game itself is fine. Focus on re-downloading and turning off security software during installation. System File Checker:
Once installed successfully, you can re-enable antivirus and play FIFA 13 normally.