You can use any of the following method to download your videos:
The common way of using the free YouTube downloader: open www.justgamingvideo.com and enter the URL address of the webpage you want to download from into the field on the top of the page. Click the "Download" button on the right and you will get the list containing all available links. Choose a format and download. As simple as that!
You can also search for the video using above form. Just enter the keyword or search term in the input box and click the 'Download' button, a search page will open with all the videos related to that keyword.