When looking for a YouTube downloader, you should look for a few things:

1) It's completely free
2) It doesn't require a shady 3rd party executable
3) It doesn't advertise to you
4) It actually works
5) It doesn't access all your data

This is literally the only program that I could find that does all these things. Good program.
(It does require FFmpeg for HQ videos, but everyone should have FFmpeg installed anyway. It's open source and safe)