Copy and paste the link of the YouTube video into the YouTube Playlist Converter.
Check the option to download the full video file (audio plus video streams).
Set the selector to: "Don't convert: original"). This option downloads video from YouTUbe in HD or Ultra HD quality without conversion-losses.
Push download button to download video in HD quality.
Choose the output folder for you video files.
Open the output folder with downloaded YouTube videos in HD or Ultra HD quality.