I'm having trouble trying to get the mac version to work. I've downloaded both files but neither are launching the game
From my limited experience with Mac, when you double click a .dmg file it will mount it to your system automatically. If you open up the file explorer, you should be able to see it listed on the left hand side.
Maybe this could help you further: https://www.makeuseof.com/how-to-open-dmg-file-mac/