TubeGo for windows works flawlessly with YouTube downloads. Recommended.

Vidjuice Unitube stopped retrieving You Tube videos after 2 weeks. Bummer.

Fileboss is a waste of time and money, because you can't refund it. Confusing interface. Says it's in trial mode even after you have redeemed it.
Attention. Don't buy a product you cannot refund within 60 days. It will be a scam.