There are many people in the world are very much upset with this problem, how to download the video from any streaming sites, its just simple, just get Internet Download manager install it in your system.
you can see the icon for the option of downloads when you visit such video websites.
For more details on Internet Download Manager
 http://www.internetdownloadmanager.com

or you can try orbit downloader its free www.orbitdownloader.com
you can try it for trail for 30 days.. else if u want crack you can get it at torrents and some warez forums !!!