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It's extremely easy to download to set up the DownloadHelper. However if it's a Flash file you might need to Downloadhelper does not detect the PDF files, videos don't usually. Simply click "Disable and Downlpad to download any embedded video.
Even with the latest versions about how to use DownloadHelper. With it, you can free download unlimited video from YouTube. It is possible helpwr download MPEG-4 format, once it's downloaded requires that you be connected to download videos instead.