I recently upgraded to Windows 10 and had to reinstall Adobe Digital Editions. I had an old version which worked great on Windows 7 but then downloaded and installed 4.0 on Win 10. The first time I downloaded a E-pub from my Library I got an Activation

[daniels5178303]

I recently upgraded to Windows 10 and had to reinstall Adobe Digital Editions.  I had an old version which worked great on Windows 7 but then downloaded and installed 4.0 on Win 10.  The first time I downloaded a E-pub from my Library I got an Activation error and cannot download the book.  My computer is authorized with my Adobe Id. What is wrong?