Library book won't load on Nook after Win 10 re-installation.

My computer crashed and MS had to send me the latest Win 10 file. I got it running and installed Adobe Digital Editions 3.0 because it has worked well with my Nook.

I have downloaded some free books in e-pub format and transferred them to the Nook. They work fine. I tried to download a Library book today and I get an error message when trying to load it on the Nook. It says "You can only authorize this computer with an Adobe ID that hasn't been previously used to authorize any other computer or mobil device. Please try again".

The books that load are e-pub format and the library book is Adobe Content Server Message