It seems like the Feral Heart Files seem to be Corrupted. Though, I can't be 100% sure since there is many problems that you have Explained and such. It's hard to put my finger on the exact problem though it does seem like the Files have been Corrupted, causing the game to no longer work. Is there a possibility you could put up a Picture of the "Feral Heart doesn't work anymore" before you get to Log in or does it close out the game before you can do anything about it? Try checking over the Files and such to see if you have all Original files from the game when it was re-Downloaded. Hope it helped a little bit.
~Wolfer