Go to the official Microsoft Download Center. You are looking for the file titled "DirectX End-User Runtime Web Installer."
Avoid shady “download manager” sites. The source is Microsoft’s official DirectX End-User Runtime Web Installer (still available via offline redistributable). directx 9 download windows 7 64 bit better
Extract just that DLL from the redistributable CAB files. All DLLs are inside Jun2010_D3D9_x64.cab and Jun2010_D3D9_x86.cab . Use 7-Zip to open the CAB, copy the needed DLL to System32 or SysWOW64 , then run regsvr32 filename.dll . Go to the official Microsoft Download Center