Ah, I had a similar problem with the custom fur textures I was using. They added new folders with the update.
To fix this:
1. Go to your FeralHeart game folder
2. Click Media
3. Open Textures. The fur textures you were using previous are here. Copy anything like cbodyhead, cbodymask, etc. (Do the same with fbody, etc.)
4. Open the Masks folder. Paste the custom fur files here, click "yes to all" when replacing the files.
5. Presto!