I have a couple aternatives I bounce between:
YouTube Video and Audio Downloader is a good one.
ByClick Downloader is really good, but can be slow. Bu I think 4K Video is another decent one for YouTube as well, particularly if you want to grab full playlists. I use these for youTube mainly. But still use VDH for other stuff.
Something new with OF is that they're making videos that can't be downloaded or properly detected through the OF downloaders. Too bad for folks like me who just keeps them rather than trying to go against the code and sell them. But I notice that with other sites as well, where videos take a matter of seconds to just have 100 something bytes, or 0 bytes.
Hoping VDH updates their stuff soon.