Is there a good video downloader? I don’t require it to be free.

I just want a solid, reliable downloader for videos (YouTube mainly, but from other places also would be good) and for ripping the audio of videos off to mp3 files.

I don’t mind paying. I’ve paid $20 to $30 annually for years for YTD Downloader. However, for months now I have to install it every time I boot up my laptop. YTD Downloader tech support was no help. So I don’t want to renew.