I just downloaded the newest version: Hotfix (0.20.005 Vac) on my Mac.
Now the game gets stuck at the first loading screen, the "mac rainbow ring" comes up and the only way out is if I force quit the game. I also tried going back to the 0.02.004 version but the same thing happens. Not sure why this is happening.
MacBook Pro (Retina, 13-inch, Early 2015)
Processor 2.9 GHz Intel Core i5
Memory 8 GB 1867 MHz DDR3 Graphics Intel Iris Graphics 6100 1536 MB