The solution of the error “d3dx9_31.dll was not found” when running games

This error may occur if the computer has an old version of DirectX installed, so it is solved simply by downloading and launching a web installer that automatically updates DirectX via the Internet to the latest version.

Download the DirectX web installer from the link below:

https://www.microsoft.com/en-US/download/details.aspx?id=35
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