Building the Future
VLC Media Player
VLC Media Player is one of the most flexible media tools available for any device, and it also happens to have the ability to assist download content from online sources. To do that, you’ll need to be using the desktop app, not the Android or iOS counterparts. VLC is available for download on Windows, macOS, and Linux too.
The first step is to go to the YouTube video you’d like to download and copy the URL to your clipboard.
Example video link
Next, click Tools on the video stream and find Codec Information.
The Location field at the bottom of that window will include the exact URL needed to copy and paste into your browser.
From there, simply download the video by pressing the download icon of right-clicking the video, then click Save video as…
The last I checked, this method maxes out the resolution at 1080p.