Furniture RGB Pack crashes

Purchased tokens for Furniture RGB by 4Kstudios pack a few days ago but error code error (CE-34878-0) appears every time we try to start it up - all updates are installed, so the pack simply doesn't run.  Asked a family member to download it and he gets the same error message.  PS won't refund token purchase.  Mojang won't refund tokens.  Please advise.