How can I download Nuendo 7 NEK installation file?

My recent Nuendo 7 NEK licence upgrade from 6.5 was automatically upgraded to Nuendo 8 ( grace period). Now I’m having trouble finding the installation file for Nuendo 7 NEK, which I now desperately need after having upgraded my studio with a new computer.

Being a sound designer as well as a composer, I’m from time to time ( like now) being asked to make new versions of some of my older film projects, ( like upgrading an old Dolby stereo soundtrack to a 5.1 or a 7.1 soundtrack). Without access to my old VST plugins and instruments, I’m totally lost.

So please: Where do I find the Nuendo 7 NEK installation files?