I have successfully downloaded library books into the ADE library on my MacBook Pro and am able to open and read them on this device. However, when I try to transfer these downloaded library books onto my NOOK device, the title shows up in my Nook library, but when I click to open, I am instructed each time to enter my ADE email and password, and then when I do that, I get the message: "Error opening book. This book is not activated for current ADE users". Three weeks ago, I had no problem with this. What is going on? How do I access my books on my NOOK?
Please test the issue and if still, you get the same issue then please try following steps,
Go-> Go to folder. Go to folder dialog will appear.
Type ~/Library/Application Support/Adobe/Digital Editions.
Drag the activation.dat file to the trash.
Let us know if it helps. ^AJ
Am not clear which folder on Mac are you referring to?