Download all parts and combine with HJSplit: http://www.hjsplit.org/ Audio is fine in the original file, YouTube messes it up.
If you're unable to play the file, download VLC Media Player or Media Player Classic.
Ripped by hkskw @HDC The Mediafire links are not mine, credit to the mystery uploader. The links may break if the uploader decides to delete the files. If reuploading, please credit by linking back to this video.