Does not work on Retina display MacBook Pro

Just purchased. None of the videos work. Just displays a black screen. Visited the developers support forum and it seems they are aware (the last time the developer responded was 3 weeks ago, however). Will change rating when I can actually use the product. At this point in time, all youre getting for your money is a link to the download location for Xcode. Needs to be fixed. Very disappointed.

MattyF00 about Training for Xcode, v1.2