DragonBox Elements for Mac computers will be out in a few days, available for purchase through the Mac App Store.
Update (09/09/14): the game was rejected by the Mac Store because of a change in Apple requirements. We’re working with our platform provider to try solve the issue.Chris Nolan.ca commented
You said on July 14 "a few days"... I can't find it on the App Store. Is it not there yet?