I have had this same problem with library books and found a thread on here that solved the problem...it is a pain, but at least it worked and I could read my books:
Uninstall ADE.
Reinstall ADE.
Factory Reset Kobo.
Download my library book to ADE.
Plug Kobo into computer.
ADE will automatically detected Kobo and reauthorize.
Sync to Kobo.
Book should open! (this info was copied from a previous post by ottawabound)
Hope that this helps! It worked for me.
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