This is a 32-bit application. It will work in Windows 10 64-bit but with 4Gb RAM only.

Steinberg is proud to present the latest version of its award-winning Nuendo audio production environment. The Nuendo 4 Advanced Audio and Post Production System enhances audio production for audio post, studio production and live recording with new tools to accelerate workflows, boost creativity and save valuable production time. Among the new features are a world-class automation system, new VST3 plug-ins, the MediaBay file management system, new audio post editing commands, routing and recording enhancements and much more.

https://www.steinberg.net/