No version downloaded would start, an error message shows up and then the software quits. Even the 2.21.1 for which I don't have a license being a student trying to use the student license.
"OctaneRender 2.21.1 cannot be opened because of a problem.
Check with the developer to make sure OctaneRender 2.21.1 works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X.
Click Report to see more detailed information and send a report to Apple."
Same message as per the 1.20.
Thanks in advance,
Massimo