is there a way for me to redownload the app on another computer without having to pay again?
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Make an Itch.io account! I was worried about that too, but since Itch takes your email when you buy a game, when you make an account under your email, it transfers all the games you bought :]
Edit: there should be a pop up that says "you already paid for this" and if you click on the link, it takes you straight to the download page