I'm not too sure if this is what your looking for sus...but if you do this;
1. go to the link You are not allowed to view links.
Register or
Login 2. select the url of a youtube vid you want to download
3. then press download
4. up the top the java plugin will come up and you click on 'run this time'
5. then a pop up will come up and you press' run'
6. then on the webpage click the type of format you want (flv, mp3, mp4 etc)
7. then it will download onto your computer...and wallah it's done!
Hope this helped and is what you looking for...it's pretty simple don't worry you will have no trouble.