Well, I am so sorry that we only have windows version Easy Mosaic softwares.
There are two options for MAC user to get their photo mosaic or other mosaic project done:
A. Install a windows system on your MAC computer. I know APPLE allows new computers install win system.
B. Contact me, We provide mosaic design service to our customer too. Professional quality. Whoelse know mosaic more than us? Email us: firstname.lastname@example.org