Okay, so, first extract the zip. Or, inside the zip, navigate to the media/textures/markings folder and select everything inside of that folder. Then, in your FeralHeart directory, go to C:/FeralHeart/media/textures/markings and drop everything inside of that folder. When it asks you to replace some files, click yes.
Then, go back in the main zip and find the markings.cfg that is outside the media/textures/markings folder and take it to your FeralHeart directory, or C:/FeralHeart. When it asks you to replace the file, click yes.