Microsoft has posted DirectX 9c Final, this is the official release.
This download provides the DirectX 9.0c end-user multi-languaged redistributable that developers can include with their product. The redistributable license agreement covers the terms under which developers may use the Redistributable. For full details please review the DirectX SDK EULA.txt and DirectX Redist.txt files located in the license directory.
Supported Operating Systems: Windows 2000, Windows 2000 Advanced Server, Windows 2000 Professional Edition , Windows 2000 Server, Windows 2000 Service Pack 2, Windows 2000 Service Pack 3, Windows 2000 Service Pack 4, Windows 98, Windows 98 Second Edition, Windows ME, Windows Server 2003, Windows XP, Windows XP Home Edition , Windows XP Media Center Edition, Windows XP Professional Edition , Windows XP Service Pack 1