Error 1: “ISDone.dll” or “Unarc.dll” Error

Ensure Your System Meets the Requirements

: Before installing any game, make sure your computer meets the game's system requirements. For "Batman: Arkham Knight," these are:

Part 5: Legal & Ethical Considerations

This is the elephant in the Batcave. Downloading a repack of Batman: Arkham Knight is only legal if you own a legitimate license for the game (e.g., purchased on Steam, Epic Games Store, or physical disc). The repack itself is a redistribution of copyrighted code.

• Reinstall DirectX (in _Redist folder)
• Install Vulkan runtime (optional but helps)
• Ensure video files weren't skipped during selective install

The PC Port itself.

There is only one real negative: Even with a perfect repack, Arkham Knight has a history of poor optimization on PC. While FitGirl provides a perfect copy of the files, she cannot fix the game's coding.