Cubase 6.5

Hi guys! i’m new on cubase, so basically i’ve been trying cubase 6 demo for a long time and i really wanted to buy it.
And Steinberg site only provides with ‘‘updates from’’ (any version of cubase) ‘‘to’’ (cubase 8.5) and i don’t have any type of version of cubase, I want to buy Cubase 6.5 from 0. Is is there another way to buy it? and how?