To download this youtube videos go to keepvid.com and enter below links in the box provided there and click download and follow steps
link 1: http://www.youtube.com/watch?v=Rk6cWgNOVbk

link2: http://www.youtube.com/watch?v=8S8aZolpfCo


FOR FIREFOX USERS YOU CAN ALSO USE FAST VIDEO DOWNLOAD ADDON TO DOWNLOAD VIDEO FROM YOUTUBE