I have a Simple Touch Nook, software system 1.2.2. In February I was able to successfuly download ebooks through my library and load them on my nook. When I tried last week I got the error dialog "This book has been returned. Loan not on record". I had just checked it out. I have deregistered and reregistered my computer, uninstalled and reinstalled ADE, got in to my regedit and renamed my Adept file as per the recommendations found on this forum. I have adobe 4.5.11, Windows 10.