Hi! Thanks for using the assets. I apologize for the confusion. I've been working on updating the Unity version with the new updates and releasing the other assets on Unity as well, and should have that done in the next week or so.
However, I'd be more than happy to send you a key for the itch.io version as well as the prototype pack. Could you send me message to deadrevolvermusic@gmail.com and then I'll send that over.
I hope this helps :)