Yes, you guessed it. This downloader will fetch Instagram videos for you. Unfortunately, there are 2 caveats.
1) This isn't like the YouTube downloader above, where you can type pp and expect a shortcut.
2) This does not work with private Instagram accounts - those are private for a reason.
With this tool, you have to copy the Instagram video URL (either from the desktop version of Instagram, or using the 3 dots above the video, in the app itself.
Once you do that, simply paste the URL in the text field you see in the image above, and DownloadInstagramVideos, as the name implies, will download the video for you.