This add-on can be a little finnicky. However this is due to youtube fighting their war on any add-on that intrudes on their space.

Besides not forwarding me to a new page (which many youtube downloaders do), but letting me download within the youtube screen, there are multiple download options which is perfect.

Now I did get a limit after downloading quite some files, but after a single donation you get access to the "pro" version. In my experience this is well worth it. If the free version works perfectly fine for your wishes, consider dropping a few bucks to unlock the pro version so you can keep using this addon, and it helps the developer keep fighting the good fight against youtube.

Once you unlock the pro version, you can also get support when you have issues. I suddenly ran into file name issues, so I decided to send an email and got a swift response later that same day. After following the instructions I had no problem finishing downloading a huge library of files.

Depending on what you want to use it for, this add-on is perfect and gets regular updates, which also helps fixing the add-on after one of youtube's regular updates and changes break it (like with so many other of these add-ons which are now dead after no updates for weeks/months/years).