To resolve it I would
Go to the Barnes & Noble website then My Nook-My Libary you should be able to see your 4 purchased books listed there with a download button next to them if so then
Open up calibre delete the books you previously donwloaded then go to the B&N site and re-download just one from your account, import it into calibre open it have a look if its ok go back to the B&N site and try another one and so on.
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