[Rykslaw]

Happily, there is a solution. I'm always a bit disappointed in posts that end witout a useful solution because people have moved on. So here is mine:

Install the Melodyne 30 day demo, then run it standalone from the installation location, such as:
C://Program Files / Celemony / Melodyne 5

This seems to activate the plug-in as well. I did notice some internet and audio driver instability after doing this, however. The Melodyne trial license requires an active internet connection to run, and their services seem to use too many redirects. I'm not sure if the audio driver instability is related or not. May be a USB connection that has become loose on my audio controller.