Hello! Does that new .exe file you have show up as 0 bytes? If it does, then try to reinstall it, and continue until it shows up as 721 byts or similar. Then move that one into your main FeralHeart folder and it should work. You may get a message warning you that the file may not be safe, but allow it anyway.
Will it not download from the download (https://feral-heart.com/index.php?option=com_content&view=article&id=23&Itemid=40) page?
(https://i.postimg.cc/kG31L0Kj/image.png)
Awesome! So glad you got it working. I'll be locking this now since you got it solved~