For users on , DX11 is already present. You can ensure it is up to date through these methods: Directx 11 - Microsoft Q&A
DirectX 11 (DX11) is a core graphics technology built directly into modern Windows operating systems, meaning you generally do not need a separate download to "install" it. Instead, ensuring it functions correctly for your NVIDIA graphics card involves updating your drivers and Windows system. nvidia-directx-11-download