ADE won´t accept acsm files

When I try to drag an acsm file to ADE I get an error message: E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER. I have tried to deauthorize ADE and authorize again but get the same error message. I have used this process for at least five years when buying ebooks, using ADE to get the epub version, removed the DRM and then used Calibre to convert to MOBI. A couple of days ago it suddenly did not work.

Any suggestions?

Tried to uninstall and install again and load down a new book. Now ADE tries to download content but does not fulfill, stops at 99% and continues running.