This one:
https://youtubedownloader.com/#infoThe only thing I did not like was that it also downloaded a player called "Hub" (I think its called). All I did was go into my control panel to add/remove programs and delete it.
Also there will always be an ad at the very bottom of this downloader. If you send them a few bucks (I won't) then the very small ads that come up at the bottom will go away.
When you download it be careful what you click or Yahoo will become your home page, (I hate that) and then you will have to reset that too.
The other one I had was called "Freemake".
It worked great for years and then the homo's wanted money to download anything over 3 minutes.
The graphics and layout on the new one is almost exactly like Freemake. Which is good for me.