Uploading it so that it's browser playable would be a great idea, but in the meantime you can get it by downloading it through your browser instead of the Itch.io desktop app.
(IFeelOdd: To make it so that the Itch.io desktop client can download it, you can tick the windows/mac/linux boxes next to your existing upload. To make it browser playable, upload a duplicate copy renamed to index.html and tick the "this file will be played in the browser"/"enable scrollbars" boxes, and probably the "mobile friendly" one too.)