BA uses the registry to keep track of what it has installed. It stores the data in HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\Cakewalk\Installers If it finds a record there, the Add-in is disabled. Remove the record and the option will be available. Can't give you the exact record name because I did not install the Melodyne bundled with CbB. Inspect the data in the records and it should be clear which one is associated with Melodyne.