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Installation and download/setup issues; upgrading, operating system compatibility; getting started/training guides/tutorials. (Example: I cannot launch ARCHICAD, please help!)

Moderators: Karl Ottenstein, LaszloNagy, ejrolon, Barry Kelly, gkmethy

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.

Any help is appreciated!