Plenty of people here are running 2.8 without problem on Macs, so this is likely to be a set up / conflict issue somewhere.
The developers are in Melbourne, so they won’t have seen your post yet, and I’ve no doubt US Mac users will comment shortly.
So please don’t rush to bin it too quickly … it really is a great application which is used in a wide variety of ways, and once it’s running you will find it to be a good addition to your software inventory.
I’m not connected with Plugin Boutique or the Scaler folk, just an enthusiastic user.