What DirectX End-User Runtimes does
Microsoft's DirectX End-User Runtimes (June 2010), version 9.29.1974.1, is a self-extracting redistributable for selected legacy side-by-side libraries such as D3DX9/10/11, XAudio 2.7, XInput 1.3, XACT, and Managed DirectX. It does not install or upgrade the DirectX graphics runtime built into Windows and should not be described as a combined DirectX 9/10/11 upgrade.
The downloaded EXE is an extractor, not the final runtime installer. A deployment must run it to a controlled temporary directory, then run the extracted DXSETUP.exe, capture its exit/reboot result, and remove only that known temporary directory after review. Microsoft says the installed legacy runtime cannot be uninstalled. Do not scatter extracted CAB files into an unvalidated folder or treat successful extraction as successful installation.
Use this package only when an application's publisher or Microsoft identifies a required legacy component. A missing DLL name can have other causes, and downloading individual DLLs from third-party sites is not an acceptable substitute. The publisher page lists older supported operating systems and states that the package does not modify the Windows DirectX runtime; modern managed environments still require compatibility testing.
The publisher page supplies the redistributable and documents disconnected installation, but it does not display a checksum for comparison. Manual evidence remains open: download the package, record SHA-256, verify the Microsoft Authenticode chain and timestamp, run extraction/setup in a disposable matching system, capture files/components, exit code and reboot state, and test the requesting application. No such execution was performed.