You can find all the information you need at this site.
http://www.ddisoftware.com/qimage/downloads.htm
On the Mac question, many have reported success on a MAC by installing Parallels, to make any version of Windows run. Then of course, so will Qimage.
Hope this helps....

But if you going to attempt to run Qimage on your new computer, I strongly urge you to purchase Ultimate... It is so full of features that are ahead of its time; such as Deep Focus Sharpening.
DFS allows sharpening with no halos.
Tone Targeted Sharpening, to allow you to isolate a tone or set of tones to sharpen or ignore...
Have a look at the demo.

It will amaze you.
Fred