In the meantime, I can say that the MoI x86_64 releases run perfectly on the M1 "Apple silicon" Macs. I do not claim to have tested all functions, but all that I normally use work just fine. I've also run Michael's arm64 prototype and noticed no difference in performance for the models that I work on, the native arm64 binary might be faster on more complex models. MoI V4 on a new M1 Mac make a great combination!

--Larry