VLC Media Player
- copy the youtube url
- Media > Open Network Stream....
- An "Open Media Window" will open, click on the "Network" tab at the top
- under "Please enter a network url", paste the url
- hit "Play" in VLC
- go to Tool > Media Information
- at the bottom you will see "Location" > copy the location
- open a page in a web browser, paste the location in the search bar
- the video should be playing in your browser
- Right click on video > Save Video As...