Unfortunately, Mac support is pretty iffy. You can try this out:
Try running it in a local web server (Thanks to Joewolf for the method. https://www.reddit.com/r/RPGMaker/comments/186fmuh/guide_how_to_play_windows_rpgm_mvmz_games_on_mac/?rdt=37314)
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STEP 1: Install Node.js
• Go to Node.js and install it. (https://nodejs.org/en/)
STEP 2: Install http-server
• Open Terminal and enter the following:
sudo npm install --global http-server
STEP 3: Get path to game
• Finder → View → Show Path Bar
• Open game folder → www
STEP 4: Run http-server from game folder
• Open Terminal → type cd → drag & drop file path of www folder → press enter
• Enter http-server to start the local server. Use the following code:
http-server -c-1
• Copy & paste the local URL into any browser, and the game starts!
• When you're done playing, closing the Terminal window turns off the local server