Hi all - I'm a new forum member, but have used Archicad on and off for a few years. I just downloaded the education version of ArchiCAD 21 on my Mac and it won't open - with El Capitan or Sierra OS. It crashes every time - I've uninstalled, and reinstalled with no luck. I've also run updates. I previously ran the education version of ArchiCAD 19 on El Capitan with no problems for nearly a year.