gunrunnerjohn's correct--you can use Parallels or VMWare on your mac (I use VMWare myself) and then install Windows. Once you've done that, you can install the LEGACY System Utility and do your upgrade. But I recognize this may be more than some Mac users are comfortable with. Your other options are to find someone at a club who can help you with the update, or purchase a pair of v1.51 modules from Mike in customer service when they are available in january.