Here's what you really do need to know
To download a video file from this website, follow these steps:
Here's what you reallly don't need to know
The Internet browser add-ons or services like Video Downloader or Keepvid that are commonly used to download videos posted on YouTube and elsewhere won't work for videos on this website. That's not a big deal.
An easy alternative would be to simply give you the Internet address of the Flash video file you'd like to download so that your web browser (i.e. Internet Explorer, Safari, Firefox, etc.) could download it. However, that alternative doesn't exist, because browsers won't download video files directly. They'll let you download and save .pdf, .doc, .xls and other kinds of files, but not a Flash (.flv) file.
Fortunately, there's a way around this. Since we know a file with a .doc extension can be downloaded without problems, I simply changed the .flv extension of the video file to .doc. All you have to do is change the extension from .doc to .flv after you've downloaded the file. It's silly to have to do it this way, but it's easy and it works.