No, I just installed X3 and I have Melodyne editor..... all you need to do is make sure you have the latest version of 2.1 and it will be there based upon your iLOK registration....
Let Melodyne install via X3 and just insert Melodyne in an audio track and it should be your current version....
No need to delete or uninstall your current version as long as you have the 2.1. The install of Melodyne has the code for all versions, it is your iLOK version that determines your features.
Jim