Paste the YouTube video link & select the video format & click on start button to download. Press back, to avoid redirects.
Unlisted & Private videos can't be downloaded. And YouTube's original content (or) videos with buy or sell option also can't be downloaded.
Video link starts with m. (or) any third party sources also can't be downloaded. Make sure you pasted the link is in youtube terms.
Your browser doesn't allows to download. Try in different browser.