Some of the Problems listed in the forum were very similar to the things that I was having trouble with. I would download a book from the library and install it on my Kobo Glo HD unit only to find I couldn't open the book due to a rights violation. I could read it in ADE 4.5 on my computer, and then was directed by Kobo support to remove 4.5 and install ADE 3.0 on my windows 10 machine. I reset my Kobo e-reader, reauthorized the e-reader, downloaded a book to the e-reader and I can now read the book on the Kobo e-reader
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