Currently, Vitruvius recommends Windows 10 64-bit as the operating system.
Processor - 1 gigahertz (GHz) or faster processor
RAM - 2 gigabyte (GB) for 64-bit OS
Hard disk space - 20GB for 64-bit OS
Graphics card - DirectX 9.0 or later with WDDM 1.0 driver
Display - 1920x1080
See here for the supporting Windows Article about Windows 10 system requirements.
Alternatively, Vitruvius has users with these system requirements using the software successfully on Windows 7, 8, and 10.
The Vitruvius Team