There is precious little free Bible study software out there for Mac but Bible Desktop is an attempt at providing something that normally can go for anything up to a few hundred dollars.
Bible Desktop runs across platforms and like
Bible Desktop proceeds to warn you that you are accessing the internet to download the books but nothing happens. You can try again manually by going to "Tools" and the "Books" but the same thing happens again. In the Help section, the developers warn that "if you live in a country which monitors internet activity, you may want to find another way to obtain Sword modules". I can't be sure the problem had anything to do with this but most annoyingly, it fails to specify what these alternative methods are effectively rendering the program useless to me.
Bible Desktop looks like a basic if noble attempt at providing a free Bible study program for Mac. However, I hope you have more luck than me trying to download a Bible or passage to load into it otherwise it's not much use at all.