This is required for DirectX 11.1.
To help you get the best performance, are you having trouble with a specific game, or are you looking to improve overall system graphics? DirectX End-User Runtime Web Installer - Microsoft directx-14-download-windows-7
Alternatively, you can install the from Microsoft to update older libraries (DirectX 9, 10, 11) used by legacy games. This is required for DirectX 11