This review has two parts: The free version review, and the paid (Premium) version review.

The free version is pretty much junk. It takes hours to "convert" a video after downloading (a process they call "aggregation"), and the only reason the program does this is to add their advertising QR code in each and every frame. So, congratulations if you used this, you just spent $.05 in electricity, and a whole bunch of CPU time, adding a commercial to your video. What a useless piece of ****. At least it reliably detects and downloads HD and higher resolution videos (something which the other free converters can't even achieve).

The paid version ($28.50 USD, 18EURO as of this review) is a lifetime license, it works great, it's fast, and it downloads HD+ resolution videos reliably from YouTube. It will also convert on demand, and probably has some other features I haven't explored yet. It's sad that I had to pay money to get a good product, but the programmers gotta put food on the table. If it takes holding people hostage to pay for their software to do it, then that's the choice. Pay up or don't bother installing this add-on.