You can download the latest version of DirectX 9.0c, the June 2010 update (now called the 'legacy DirectX SDK' by Microsoft), from Microsoft's website: Standalone Installer / Web Installer. Maybe it is also possible to just install the latest one from June 2010, i'm not sure if it contains the earlier versions too. This gives you a clue of what to search for, the keywords directx Mar2009 lead me to the microsoft download page.

The list below shows the available DirextX-9 versions, the version can be found at the third column. If the missing file is for example d3dx9_41.dll, it means that DirectX-9 version 41 is required. To find the correct version i analyzed the error message. The exact version depends on the file which is required by your application, in my case it was directx_mar2009_redist.exe. You can download the 'DirectX end user runtimes' from Microsofts website. This package is localized into Chinese (Simplified), Chinese (Traditional), Czech, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese (Brazil), Russian, Swedish, and English.Had the same problem when i tried to run an older game on Windows-10, it complained about a missing dll d3dx9_41.dll. For full details please review the DirectX SDK EULA.txt and DirectX Redist.txt files located in the license directory. The redistributable license agreement covers the terms under which developers may use the Redistributable.

This download provides the DirectX end-user multi-languaged redistributable that developers can include with their product. The Microsoft DirectX End-User Runtime provides updates to 9.0c and previous versions of DirectX - the core Windows technology that drives high-speed multimedia and games on the PC.

DirectX-Redistributable (August 2008) für Windows XP und Vista

Directx 9.0 c windows 7 32 bit download