You have to make sure you fully uninstall it. Just uninstalling the game doesn't work. What I did was uninstalled it, deleted all the FeralHeart folder in the C disc (Local disc C:), deleted the FHsetup and FHpatch setup, deleted any short cuts to it, deleted it from my task bar (I have windows 7 which has the task bar at the bottom with shortcuts in). BUT I saved everything I wanted to keep like presets and such in a folder called FH stuff in my documents. Then, redownload the installer on the site, install that. Add the patch after by installing the patch setup.
Another thing, there's a recent server issue now involving a patch so if this method doesn't work, it could be because FH is updating again