Guitar Vol. 1 Sounds Not Appearing

I know other users have had this experience, where MuseSounds doesn't appear in the mixer, but the act of deleting and reinstalling software, deleting the sounds and downloading again, or not having Musescore running while downloading doesn't work at all for me, so I'm wondering what else I could have done to fix this problem that I haven't tried yet. All the files are in their respective folders. I've experimented copying "Electric Bass" into the Muse Strings folder to see if it would appear in there (haha no). I'm also a mac user, if that helps.

Thank you!