Video_Codec_SDK_9.1.23 requiring DirectX SDK which is no longer available

Even the most recent Video Codec SDK packages seem to require downloading DirectX SDK from MS, which has been deprecated for many years and none of the download sites I tried have it. Wiped clean… Is there a way to use Windows SDK instead? Would appreciate a clear set of steps to satisfy setting the environment variable: “DXSDK_DIR: pointing to the DirectX SDK root directory.”