Mac App Store is the simplest way to find and download apps for your Mac.To download iShowU HD Pro from the Mac App Store, you need a Mac with Mac OS X 10.6.6 or later. Learn More. Description Want to capture everything on your screen? 3d games bogging down ordinary screen capture software? Those days are over: welcome to iShowU HD. Built for speed. Built to “just work”… iShowU HD has been rebuilt