We are trying to track down the “-100” error but need some more information to diagnose the problem. If you download and install this version of Rhino and do the following:
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Open a terminal window from Launchpad

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Start Rhino using this command: “/Applications/Rhinoceros.app/Contents/MacOS/Rhinoceros -RhinoLog”

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Close the error dialog you get when starting Rhino and run the Console application from Launchpad

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Navigate to ~/Library/Logs/Rhinoceros in the control on the left

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Click on the Rhinoceros.log item and choose “Reveal in Finder” and upload to this post or select “Mail” and send it to johnm@mcneel.com . This log file should help us diagnose this problem.

Thank you for your help diagnosing this problem.