Hello!
The android version was made several years ago and is included as a free extra. It is not supported or updated anymore, and therefore may not work on newer devices. You may be able to bypass the error message by adjusting your android settings (particularly those around installation of apps from unknown sources).
If that does not work for you, feel free to contact itch.io support for a refund: https://itch.io/docs/legal/terms#refunds