Extension not working...

Hi ! I installed Savefrom extension on Chrome, and I wanna download this video (http://www.youtube.com/watch?feature=player_embedded&v=AAoXKLSOXmE) but when I click on the SaveFrom's extension button, it show just "Download from current page"... And when I try it, I can't download because this video is more than 200 MB....

Help me please ! And thank for the website ;)