Launch FrostyModManager.exe . Click Add and navigate to your NFS Unbound installation folder (e.g., Steam\steamapps\common\Excalibur ) to select NeedForSpeedUnbound.exe .
Legit drift mod repacks for NFS Unbound are typically between 150MB and 400MB. If you see a file claiming to be a that is 15MB (likely a virus) or 15GB (likely the full game pirate, not a mod), delete it immediately.