Kalmbach has a patch for Mac users. You call them and they email it to you.
It replaces the installer.
It worked on my old PowerBook G4 and my intel iMac. Yeah, finally!
It is very cool. Reading the old issues and how people had to use clock springs, and files and other crude tools to build models gives me new respect to the early model railroaders. Some of the work is incredible, then you consider what they had to start with and its even more amazing.
The other thing it makes me realize is the deep and rich history that this hobby has. Yes, very cool indeed.