This update is typically delivered through Windows Update . If your system is fully updated, you likely already have the DirectX 11.1 components installed.
DirectX 11.1 was originally designed as a native feature for Windows 8. To bring its benefits to Windows 7 (both 64-bit and 32-bit), Microsoft released the Platform Update for Windows 7 SP1. KB2670838 directx-11-1-download-windows-7-64-bit-32-bit
For manual installation, search for KB2670838 on the Microsoft Update Catalog . Ensure you select the version matching your architecture (x64 for 64-bit or x86 for 32-bit). Are you trying to fix a specific error in a game, or This update is typically delivered through Windows Update