Downloading Videos from you tube is very easy now-a-days but sometime it is hard to download channel or playlist videos in bulk. So if you want to download any particular channel or playlist from you tube. Just follow three steps.
Just copy the url of you Playlist Link or Channel ID from you tube and go to http://youtubemultidownloader.com . Click on top Channel or Playlist menu on this site and paste your url on the box.
Now it will show all the videos of the playlist or channel that you put on the Playlist Link or Channel ID box. Then just
create a .txt file on your computer and copy all the links from GRAY box and save the .txt file.
Open IDM and click on Tasks menu , then click imports and finally select From text file that contains all videos link on .txt file to download all the videos..