Then you most likely didn't uninstall it properly I'd say.
My guesses are you exported the map, and got extra copies of the water particle in your particle folder, then you tried to reinstall the game without removing all the FH content, which made the installer just slap all the files into the old folders, with the very same particles that cause the crash still there.
Go into your particles folder, see if you can find any particles with the name _01 _02 etc. Remove them from the folder, then try to run the game again.
If that didn't help make sure you remove EVERYTHING of feralheart, as in C:\FeralHeart.
Once it's gone, install the game again with preferred, a new downloaded installer, then try to run the game again. Cause honestly, if it worked before, stops working, and you reinstall it completely and it STILL doesn't work, it wouldn't be the game that is the issue anymore since you got everything back as it used to be, but also the very same game everyone else has.