Upgrade to Cubase 6

Hi,

I currently have Cubase Elements 6 on my iMac and wish to upgrade to the full version. I’ve tried Cubase 8 on a friends pc and I don’t enjoy the layout and some of the features it comes with it and would rather upgrade to the full version of Cubase 6, however I have had bno luck in doing so. Anyone know how I can get around this issue?
Thanks.