Oh yeah I get that too-
Admittedly none of us in the team is using the desktop itch.io client, so we are unfamiliar with the way its downloading/updating features function. It's pretty likely that this error has nothing to do with the game files at the very least, since the builds work just fine when installed manually. What we can tell you is that a regular update on our end means deleting the previous downloadable builds from itch.io and uploading the new ones. We haven't set up butler yet, which may be why this happens.