Full installer for windows

I upgrade our 3 copies of Nuendo today from 7 to 8. The 8.1 updates in the downloads works fine for the 2 mac we have but the 8.1 update for the windows version says it requires 8 to be installed first. I can’t find the full installer for 8 anywhere. Help please! Where is the full Nuendo 8 installer?

Check your MySteinberg: