copy the YouTube video link you want to download and paste in http://savefrom.net/
on a serious note, unless you're looking for those 1980's Wu tang shaolin movies, why can't you use torrents or other site like my favorite http://www.watchfree.to/ , http://www.alluc.ee/ to get links of the movies and download them using idm?
It is very straight forward, it depends which browser you are using - add the download “extension” or “addon” and the download button will appear on the browser or below the video as below.