What is V-ray standalone?

I saw that if I want to use V-ray in Blender I should first get a V-ray standalone. But looks like there’s no product in chaosgroup that named “V-ray standalone”. Then how do I get it?

I got mine from here http://www.evermotion.org/modelshop/show_product/v-ray-standalone-2-0/2703/0/0/ I really don’t know why it’s not available in official developer’s shop. Seems kinda strange to me.