Download Directx Runtime June 2010 Patched Here

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For a reliable offline installer alternative, TechPowerUp provides the full 96MB package. How to Install on Windows 10 and 11

Windows automatically includes core DirectX files, but it does not automatically include the optional "D3DX" helper libraries that many older games utilize. The June 2010 package contains the final updates for DirectX 9.0c, ensuring backward compatibility for thousands of titles.