I have Sonar X3 Producer and all of a sudden, my Melodyne won't work.
 
When I try to re-activate it asks for registration. I punch in my serial code and get red numbers saying Melodyne Essentials 2. 
 
When I click ok an error message comes up saying:
"Server Error Code: 113 LicenseProductVersionNotAcceptableByClient"
 
I tried to re-install Melodyne but same result.
 
Any help is appreciated, thanks :)

Hi. Go to celemony.com, log in and activate your pc there.
All the best.

Great, thanks. Yes, I managed to download version 4 and activate that, so all is good :)

Glad you got it working