This setup worked fine some days ago. I am not sure whether the macOS or a NI update caused the problem.
When starting the Massive stand alone app or trying to load a Massive Plugin the application crashes.
I tried "Mein NI-Programm stürzt beim Start ab (macOS)" and "Wie kann ich ein Native Instruments-Produkt vollständig von meinem Mac Computer deinstallieren?" without success.