Besiege wont start on Mac

late 2013 mac pro
Intel 8 core Xeon 3ghz
64gb of ram
2X AMD Fire Pro D700 12GB
Latest OS

Also tried on Macbook Pro

CPU i7 2.7ghz
Nvidia GPU
16GB ram
15in Retina Display
Latest OS

I bought the game today. I have tried everything suggested by other forums to fix this issue and nothing will work. Black starting screen opens and then closes and I hear a Ding! In terminal it appears that It logs in, and then logs back out closing the game.