Maybe solved - maybe not
While patiently (not really) waiting for a reply that would solve my problem, I thought if I could remove the registry entry (in Windows), maybe I could start fresh with ADE.
In regedit, I deleted the key: HKEY_CURRENT_USER\Software\Adobe\Adept and then tried to download a book from my library. Success: it activated after I entered my Adobe ID and password. And now it's in my iPad.
Yet to be tested: Will I be able to download and read books from the 3M Cloud Library from my library? And will it activate books from a different library using Overdrive? All three worked fine in my old machine.
(And thanks for moving this thread. I wasn't sure where to post it - now I know)
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