I paid 99 bucks for the V3 -> V4 Studio upgrade from Sweetwater.
Now I'm struggling with the update. I downloaded the zip file, unpacked it and ran the setup. When I go to \program files\celemony\melodyne 4, though, the executable there (melodyne.exe) is Essential, not Studio. I downloaded it again, thinking maybe I'd gotten the wrong file, but it was the same file the second time.
In my Celemony account, it shows "Melodyne 4 Studio", the serial number I got from Sweetwater, and today's date as the registration date.
Next step is to uninstall Essential...