Possibly, I'm not aware of any recent changes to how YouTube handles their streams, but Jdownloader2 is your best option here. It's a multipurpose download manager and once you have it setup you can download a lot of stuff really easily, including YouTube.
You can download almost any JAV or Hentai video (or other unencrypted streams) just by using your browser, and its "Network Inspector", to get the URL of the MP4 file.
FireFox (Recommended): Open the stream page > Go to the Menu (the three lines, top right) > Web Developer > Network > Play the...
You can download almost any streaming video by using just your browser (Firefox or Chrome's) and using their "network inspector" to get the URL of the MP4 file.
FireFox: Open the streaming page > Go to the Menu (the three lines, top right) > Web Developer > Network > Play the video and you...