According to Darkroom below:

Is there a Mac version of Darkroom Booth?

No, but there's a way to run Darkroom Booth which is a bit more complicated. This video will show you the steps to take to set up windows on a mac

Video For Mac Setup

We love Macs too and wouldn't want to relegate such beautiful machines to the back of a dusty photo booth ;-) Seriously though, solid new/used Windows PCs can be had for cheap ($100+).

For More Darkroom Booth FAQ, please go here http://www.darkroomsoftware.com/products/booth/faq/