Open your browser go to http://www.youtube.com , then choose your video and see it, and then at the address click before you tube and write kiss and press enter it will take you to a new page where u can download the video for example if u want to download this video.
http://www.youtube.com/watch?v=_EC2tmFVNNE then in the address bar add kiss before youtube like this
http://www.kissyoutube.com/watch?v=_EC2tmFVNNE and hit enter ,u can download it now in any format of ur choice..& quality that to online,fast & easy..
You can also use
http://www.keephd.com
for downloading videos from youtube without any software fast & easy..& in the format of your choice…
so now no need to install software to convert & download videos from youtube.