Adobe Digital Editions Problem

I upgraded my Mac to Sierra OS and am unable to download books from the library now. I downloaded the newest edition of ADE and am receiving an error message License Server Communication Problem E_AUTH_BAD_DEVICE_KEY OR PKCS12. I have made sure my computer is authorized and tried to de-authorize it but it wouldn't let me. I changed my password and that didn't work either. I made sure that ADE is allowed in my privacy controls and it appears in my Key Lock. I don't know what else I can do. Can you help>