IT WORKS, IT WORKS, OH HOLY JESUS IT WORKS!!
Thanks everybody for your patience, and a huge shout out to Malik who spent several hours of his free time helping me to sort this out this morning!
I somehow mixed something up when setting up JAC's soundtrack, which since it's not out yet and none of you own, wasn't allowing you to have the core game.
So try it again and you should all be golden!
*in other news, I have a soundtrack for this coming out next week haha ːJAC_Clericː