I'm editing for the third time my original review... Long story short... initially, it worked great - you can't ask for anything better, it just works even with 1080p streams where audio and video must be combined.
But later on, it deactivated. Couldn't reactivate it. I asked for support, initially I had a bad impression, it looked like I had been cheated on because all I got were automated responses asking me to donate again.
Finally, the author helped me, it didn't work the first time around but finally I managed to make it work again (still not sure what happened). I made a new small donation to say thanks.
In short, best plugin for downloading from youtube, and cheaper than other ones that try to charge you about $20 for a conversion license. Thanks Dishita.