https://vgmdb.net/album/48166

Track 40, "UNI_movie_prototype (Bonus Track)", was exclusive to the Transistar Store release, which is no longer available. Did anyone manage to get it?

Never heard of it. So far, I only get the UN soundtrack SIDE-ABYSS and Exelate[st] soundtracks.

Seems like some beta music material. Maybe it exists ingame and therefore can be obtained via game rip?

I've looked in the files of the PC version and I can confirm it's not there. I guess I can check again once Late[st] shows up on Steam.