Use Unity to build good quality 2D and 3D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers. sfc /scannow If all else fails, reinstall the Windows operating system on the client. It will return the Linux, Android, iOS, macOS, Windows full-product versions on those systems.

Unity User Manual

https://docs.unity3d.com/Manual/index.html