I've just finished doing several checks, the file doesn't seem to be wrong and no one else seems to have the problem (I don't have a Mac to check).
I've created a new zip with the Mac version; completely uninstall the old game and install this new version to check if it works correctly.
Currently, the "Visual Novel Maker" engine has problems on "macOS Sierra" and "Linux Mint 19.2" operating systems, could this be your case?