DirectX 9.0c is not available for Windows 7; to actually install
DirectX 9.0c, you would have to downgrade to Windows XP (any
edition). In order to play games which require DirectX 9.0c without
downgrading your installation of Windows, you must upgrade to
DirectX 10.1 or later. DirectX 10.0 (initially included in Windows
7) did not include support for DirectX 9.0c, a decision that
Microsoft ultimately repealed when DirectX 10.1 was released.