I've been waiting for hours for it to download but at the time it almost finished it suddenly stop and say forbidden?
Is there a way to fix this?
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It sounds like either you had problems with your network or Itch had problems with the servers. If the problem persists, I can only advise you to download the game from other sources, like my Patreon. If Itch is your preferred platform, you'll need to contact the support since I don't have any control over download speed.