There are two options to run GWB on a Mac OS:
The first option is to set up a dual boot configuration, using a program like Boot Camp.
Boot Camp is a multi boot utility distributed with Mac OS X that enables users to install Microsoft Windows OS on Intel-based Macintosh computers. Boot Camp requires a Mac computer with an Intel chip; Mac OS X v10.5 or later; the latest Mac firmware updates; 10-20 GB free hard disk space; and a full, single-disk version of Windows 10, 8.1, 8, or 7. Note: Boot Camp 4.0 for Mac OS X Lion offers official support only for Windows 7.
The second option is to use a Windows emulator to run Windows programs alongside Mac applications. Many of our customers have good experiences with Parallels.
Parallels is a Windows emulator that allows you to run Windows programs alongside Mac applications without rebooting. Parallels requires a Mac computer with an Intel processor; Mac OS X v10.5.8 or later; 2 GB of memory; and 500 MB free disk space plus 15 GB for each virtual machine. In order to take advantage of the multithreading capabilities of GWB Professional, you may need to designate the number of Virtual CPUs available to the Windows virtual machine.