I do not know exactly, i was updating it through the Itch app.
Oh okay, I'm not sure if the updates work directly through the app yet.
Currently the updates are uploaded as new files, rather than updates to 1 existing file, so I figure that may throw something off app-wise. This was for various reasons, but lately I am looking into integrating with the itch app, and hopefully have that integration ready by the next update.
Until then, I recommend trying to download directly from the browser and please let me know if the same issue occurs that way.