Unlike older versions (like SM 5.0), SM 6.0 is exclusively tied to and requires Windows 10 or 11 . How to "Download" and Install Shader Model 6.0

Download the latest Game Ready Drivers from the NVIDIA Driver Page . Support generally starts with the GTX 1000 series and newer.

Download the Microsoft DirectX Capabilities Viewer. Expand DXGI Devices , select your card, and look under the Direct3D 12 folder for the "Shader Model" version. Fix: "Could Not Init 3D System" Error