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f you do the conversion and want to download the mp3 or video that was converted, you have to install this tool to take advantage of the download options. The software is called Audacity and it is a free tool. The download for Windows is here to MP3 Youtube Convert

use it, you have to open Audacity, click Preferences and uncheck the
“Download the audio/video when converting” item. You can also do this in
the Windows 7 “Startup” tab, check it, click OK to save the preference
and close the window.