Well Kaplan's QBank isn't anything you can really download, install, or copy as it's all accessed through their website, so unless someone's gone to great lengths to somehow cleverly steal Kaplan's material I don't see how they could've put the real thing on a CD. Maybe they're referring to Kaplan's free CD which includes 25 QBank-like questions for the various Step exams. In any case, as I imagine that'd be obvious copyright infringement/piracy, I wouldn't recommend trying to buy a "hot" QBank.