Cubase AI6 help & download

Hey everyone,

I am new here and hoping I can get some help; I bought a Steinberg interface that comes with Cubase AI6. I am hoping to Install Cubase AI6 again, but I don’t know where to start as I can’t find a download for it. I can’t even find an activation key or anything, I only have a piece of paper with some numbers on that I have handwritten which I am not sure if this is any help or not. What are my options here to get this up & running again as I would like to record my guitar again.

Cheers in advance.