If Alpha's solution didn't work, even though it probably did xD, there might also be another file on your computer interfering with the way FeralHeart works. Look all around in your computer, mostly in My Computer or wherever you have most of the programs on your computer installed, and look for any files that you think should be in the FeralHeart folder. Some of the files may have accidently been misplaced during installation. Or, just look for files in the FeralHeart folder that shouldn't be there and move / delete them, as Alpha said with the particles.