Basically RpgmakerMV games, that are developed and 'deployed' on windows, might not run on mac, especially not the later versions. 

(From what I've read)

There is a way you can run it on mac by using a local server, but it will require a little bit of effort on your part:

https://www.reddit.com/r/RPGMaker/comments/186fmuh/guide_how_to_play_windows_rpg...

Alternatively I'm gonna have to buy a mac...