Step 1: Find a YouTube video you want to download and copy the URL.

Step 2: Go to [ Register or Signin to view external links. ] and enter the URL you copied, then click 'Download'

Step 3: Something like this should pop up:

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Click on 'always trust content from this publisher' then click 'Run' - It won't actually run something, all it will do it bring up a lit of what type of file you can download the video with. i.e (.mp3, .flv, etc.)

Step 4: After that, it should bring up a list of ways you can download it (what type of file.) I suggest downloading it as the .mp4 file.

Step 5: After you click on the .mp4 file to download it, it should download to the place where you have your downloads set to.

Step 6: Double click it and watch it.