Because Shader Model 6.0 is integrated into DirectX 12, you cannot have SM 6.0 without also having DirectX 12 properly installed on Windows 10 64-bit.
Navigate to the tab (if you have dual graphics cards, look at Display 1 or the tab representing your dedicated Nvidia/AMD card). Shader Model 6.0 Download Windows 10 64 Bit
: SM6.0 was first fully supported in driver version 387.92 (released in October 2017). Because Shader Model 6
Radeon RX 400 Series (Polaris), RX 500 Series, RX Vega, RX 5000 Series (RDNA), RX 6000 Series (RDNA 2), RX 7000 Series (RDNA 3), and newer. RX 500 Series