Opening Cubase Pro 9 crashes Nuendo

I downloaded a demo version of Nuendo, I need the post features, which look awesome, but I can’t open my Cubase projects with out it crashing
Any idea’s as to what it might be?
I’m running a windows Pro 10 workstation
Cubase pro 9 was working fine, I thought Nuendo could read Cubase projects…

Cheers
Tommy