Flopzilla is a Windows-only software. The only way to get Flopzilla to work on a Mac is by either using a tool like Boot Camp to run an instance of Windows on your Mac, or by using a Virtual Machine (VM) with Windows installed on your Mac.
Many poker players opt to buy a mid-range Windows laptop for running tools like Flopzilla, GTO+, and other poker software that is Windows-only.