Go to your email accout you putted in while buying the game,search for itch.io messages and find the mail that titled like "your purchase of 'Buckshot Roulette'" and click on it and then there will be a button "download your purchase". I had the same problem and fixed it just like this
me too, i don't know can I donwload the new version in a free mode. I already paid for the game and I don't think I have to pay for each version of the game. Thanks.
