I downloaded Brad Thor Collectors Edition #1 and #2 to Digital Editions on my Windows 10 Laptop. Then I copied both book sets to my Nook Color, When I try to open either on the Nook Color I get an Error Dialog "Sorry, cannot open this book". I then downloaded another different e-book from the same library and opened it successfully. I can open either collection directly in Digital editions on my computer so I know the download from the library is good. Please help.