If you know how to use the file explorer, you could try to install a new copy of Feralheart without overwriting the actual one you have, i mean with this, to install in somewhere like C:\FeralHeart2
after that, you copy your map files from the old FH folder to the new one, (the .map file and his folder with the same name), and also all the custom meshes downloaded.
Copy your maps one by one and run FH, this is to know if there is a specific map making the crash.
Copy the meshes little by little, and undo when you get a crash.
The idea is to get a new and clean working FH copy and to restore the maps slowly to know if someone is making the crashes.