If you have X2 or earlier installed, you'll still be able to use V-Vocal inside X3 (via the Region FX menu, same as Melodyne).
Keep in mind that Melodyne Essential is not the proper replacement for V-Vocal. You need Editor, or Assistant at the very least, as Essential lacks a lot of features that V-Vocal can do with ease.
I kept V-Vocal around for the first few months after installing X3, but since I upgraded to Editor, I haven't used it. Melodyne Editor is so much smoother sounding and the way it works is intuitive to me (though I miss the pencil tool sometimes).