Unfortunately not. After some research, the way the payment works with files is like tiers, and in my case, I paid $10; I only have access to files at the $10 level or below. If new files come out at $15, I can't access them. And it doesn't let you add to your price, so it would be $15 more to get to the tier. It's one of the problems with having multiple files at multiple prices on itch. It's not you; it's a problem with their system, and it's really confusing. Their system wasn't really designed for multiple versions at multiple prices. It's like multiple editions of a game; the core game doesn't change price, but you pay more and get a sound pack or art pack kind of thing.