I cannot download books from my library to Adobe Digital Editions

In trying to resolve this problem I recently uninstalled Adobe Digital Editions 4.5 and installed Adobe Digital Editions 3.0 due to advice from KOBO.  In spite of this new installation I cannot download books using Overdrive from the public library to my Adobe Digital Editions on my desktop computer.  It has worked for years but suddenly stopped working.  The problem seems to be the acsm entry was not updated by the installation.