I bought e book from B&N to download on my iPad, but I am unable to download the Nook App. I have Kobo App, but it doesn't have the book I want. Why is iPad refusing that download? I went to the Apple store & was told that Nook is being upgraded effective 12/27/10 & that I should be able to download it within few days, but still no go. Someone help, please. Also, can I cancel the book I bought if I can't download the App?