@Sythra
The skins are PC only unfortunately but it is relatively easy to take the textures from the package and apply them to the quest model yourself (I've done that with a few of the skins). I haven't touched this one yet so not sure why it's giving you trouble. I would recommend watching the tutorial video for uploading their avatars and DLC (I've set it to the timestamp where they talk about DLC but I recommend watching the whole thing). Also make sure you have VRCFury in your project!
Tutorial Link
Hopefully this helps, I'm gonna try to upload this avi and the DLC myself later on to see if I can get it to work. I'll update you later.