What try you and what happens exactly?
I installed ADE 4.5.1 on my PC laptop in order to transfer ebooks from the
Overdrive library site to a KoboGlo. When I opened ADE the books were
there; however my device wasn't recognized so I followed Overdrive
directions and uninstalled and reinstalled ADE and that kept the books in
the Library but still didn't recognize my device. I then attempted to
deauthorize and reauthorize my Adobe ID....no luck. Next I reset the Kobo
back to factory settings. Then I tried returning the books and
redownloading them. Finally I tried to just remove them from the library.
After all this my ADE library ended up with ebooks "missing", mislabeled or
when I click on them it won't allow me to move them to the Kobo. The area
is grayed out but my device is still appearing on the left hand side menu.
If I attempt to open the ebook it has the following error: Error getting
License. Server Communication Problem: E_LIC_ALREADY_RETURNED
The last step I took was to uninstall the program and restore my computer
back to a time 24hours before I started this whole process.
I worked on this for two days and have fixed it with no help from Kobo or Adobe. I had updated to ADE 4.5 recently and that doesn't seem to work with Kobo. So first unauthorized your computer with the 4.5 version (can't do it with 3.0) then install Adobe Digital Edition 3.0, authorize your computer with 3.0. Then do normal epub upload thru 3.0. This fixed my problem. Good Luck