Download DirectX End-User Runtime Web Installer from Official...
https://www.microsoft.com/en-us/download/details.aspx?id=35
The Microsoft DirectX® End-User Runtime installs a number of runtime libraries from the legacy DirectX SDK for some games that use D3DX9, D3DX10, D3DX11, XAudio 2.7, XInput 1.3...
DirectX - Wikipedia
https://en.wikipedia.org/wiki/DirectX
Microsoft DirectX is a collection of application programming interfaces (APIs) for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms.
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