There should be a cfg file in the downloads. Put the items.cfg in the items folder and the markings.cfg in the markings folder.
Locations:
For the items:
C:>FeralHeart>media>items
For the markings:
C:>FeralHeart>media>textures>markings
And just copy everything into the same folder for items, and for the same as markings but in the markings folder.
Hopefully this can help you out!! ^^