It seems itch.io was sending people an old, outdated version of the asset. You should have a .zip file that contains the updated yymps file. Please use that.
I downloaded the zip file, unzipped it, tried to import the new yymps file, but it is still throwing errors. When I zip that yymps and then open it I am finding a demo yyp file within it and I think that it throwing the error
