Airy - The program can download YouTube videos in MP4, 3GP, FLV formats. It supports HD and Ultra HD videos perfectly well.
With Airy you can easily convert YouTube videos to MP3.
Features
YouTube downloading made simple
• A YouTube downloader that makes saving videos from YouTube simple and enjoyable. Just paste the link in Airy and download.
Various video types and resolutions
• You can save YouTube videos as MP4, FLV, and 3GP in various resolutions. HD, 4K and 8K Ultra HD videos are supported.
Download playlists
• With Airy you are getting an awesome YouTube downloader that can download YouTube playlists and YouTube channels.
Convert YouTube videos to MP3
• Additionally to MP3 Airy supports other audio file types. To extract audio from YouTube video, paste the link in Airy, choose the audio format from the list and download.
• Airy integrates with various web browsers - Chrome, Firefox, Opera, Safari - to catch your YouTube downloads even faster. Simply click Airy bookmark in your browser each time you see a video you want to have.
Download: 
Airy 2.15.337.rar - 18.8 MB
Airy 2.15.337 Portable