How to Download Youtube Video and Audio or Other Software easily?

Solution:

Step1: Download Full Version “IDM 5.20” from
the link http://www.mediafire.com/?ndhzmlzitdm

Step2: Install to your Computer and go to Start > Programs > Internet Download Manager to activate the IDM5.20

Step3: Restart Mozila Firefox Browser.
Step4: Go to Browser(e.g. Mozila Firefox) and type www.youtube.com and download any favorite video.

Done!