For anyone saying that they purchased the game befor but it's not letting you download the purchased version. Just go to your accounts library and click on the game link through your owned games and it will let you download it again. Going to this page normally usually doesnt work. Just a tip since I saw some people complaining that they were getting scammed. Not a scam, just have to access the page through your profile.
If that doesnt work then you're just going to have to contact itch