Can't get Chrome to download from Youtube [View all]

I don't know how to do it. There's no download button or anything. Every time I search for how to do it none of the links point to HOW to do it. It says how to "open" the downloaded file, or "find" the downloaded file etc. Assuming it is already there.

I used to use Realdownloader because it is free and a little button pops up on the upper right side of the video: click on it and voila you have a video downloading-easy as pie.

I decided I didn't want to use it because I suspect that it is carrying all kinds of bloatware.

Help! Any given and a big thank-you to you.