I bought meleodyne assistant long before Sonar upgrade included melodyne essential. I used my asst version to upgrade to editor 2.
Also I am not worried about selling a license actually. What I really need is to see the difference between melodyne editor 2 and melodyne essentials 4. Melodyne site only compares versions 4 to versions 4 that I can find. IOW, in this day and age it is possible that a limited lesser version of an app might be (might) more useful than a full version that is 2 versions older. Does that make sense.