Find a video on YouTube using your favorite browser. Then right-click on it and copy its link to the clipboard.
Open YouTube Downloader, or switch to it if it's already running, and click on the Paste link button on the toolbar. The video clip will be added to the download list and the app will fetch and display information about it.
To change the output format click on the central button on the toolbar. In the new window you will see formats and settings for video and audio download modes. Saving in original quality (without conversion) is the fastest method.
You can choose audio only, or video download mode, by using the switch.
By default the app saves downloaded clips to the Downloaded by MediaHuman subfolder, in your Movies folder (if you're saving videos) or in the Music folder (if video). You can change it in the application's Preferences. To do this simply click on the small gear icon and select Preferences in the menu. Switch to the Music output or Video output tab to change the folder for your downloads.
Now everything is ready to start downloading. To download a single video clip click on the Start button next to it. To download all added videos click on the Start all button on the toolbar.
Have a rest while the download process is in progress. While the program is downloading, you are still able to add more videos to the download queue.
When your videos are downloaded, click on Locate button to access the downloaded file.