Hi all, I'm still here. For OS X, it is important not to go all the way to High Sierra. Apple removed support for some of their older software and the Mobius UI will not work.
I'm currently using 10.9 Mavericks. I'm pretty sure Yosemite and Capitan would work. I have Sierra at work but I'm not able to test it at the moment. If you can wait till Monday I'll verify that it runs on Sierra.
I made some headway on the forum upgrade, that should be back soon.
I'm not sure if Jeff is monitoring this site or not right now Amy, and last I heard the forums were non-functioning. I, like you, am equally dependent.