Are you using the app? Does the game you are trying to download have a version for your platform? (As in, if you are on windows, is there a windows downloadable file?)
Try to download the project from the website, as it allows you to download any file the game includes.
If the game does have a Windows version but the app said otherwise, that means it wasn't classified correctly. You should report it, so that our admins can help the creator fix that.
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