User blog comment:Coco*Mew/Question/@comment-30602727-20151025055136

I hope by "download" you mean "trial"?

I think there's a trial version of Luka V4X, but I don't really remember. Plus, you would need the V4 editor. I'm unsure if there's a legit trial of Luka V2 at all

Otherwise, you can't just "download" a VOCALOID. They do cost money...