Sorry for the trouble! Some Mac OS versions no longer support RPG Maker, so it can be difficult to get the game to run.
There's a post on another one of my projects (here: https://itch.io/post/10264135) with instructions that might work for you. If they do, feel free to leave a like; I can start putting up steps if I know a given solution is reliable enough.
If it doesn't work, there's a reply with alternate instructions that might work instead. Same thing with the like - if it works, like his post instead.
I've seen 4 or 5 different versions of roughly the same steps that work for some but not others, so it might take a bit of fiddling to get working.