the NookStudy app was never designed to be used with any of the Nook devices. Apparently, B&N felt that textbooks wouldn't display well on the small screens of the devices. And, since nearly all college students have laptops these days, they apparently felt it would just work better as an app for a computer. I've heard speculation among users that there may be an app coming for the HD+, but who knows if it's true or when it might come out.
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