If you're talking about the browser version, I don't think there's anything I can do about it. When I was testing this with Firefox, this problem would occur when the game couldn't access its data (which is in a separate place from the HTML) because of the browser's security measures. Itch.io should solve the problem just by the way it hosts the game, but maybe it doesn't work the same for all browsers.
If you're talking about the standalone .exe, as far as I know that should work fine, as long as it's being run on a Windows machine. If that's the case, though, that's a concerning problem that I might be able to fix if I can recreate it.