Save just maps and presets to a folder outside the FeralHeart one. (Or to your desktop.)
Use the FeralHeart uninstaller located in the FeralHeart folder.
Delete the entire FeralHeart folder
Download "Feral Heart Game Setup" (ONLY game setup, you can get the map pack later.)
Install that
Put any maps or presets back
Hope that'll fix it. ^^
(And yes, you must download it, even though you already have it.)