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. Had the same problem when i tried to run an older game on Windows-10, it complained about a missing dll d3dx9_41.dll.

Directx end user runtime for windows 10