How do I download the wire shark tutorials videos given on the homepage

You can use Wireshark to do the trick.

Launch Wireshark and start capturing.

Open your browser and clear the cache.
For instance in Mozilla Firefox go to:
- Tools
- Clear Recent History...
Select
- Cache
Hit Clear Now

Paste the url in the browser address bar, hit enter and start the video.

When you've watched the video, stop the capture and save the capture file.
You can also stop capturing, when the video is loaded and you see the following packet in Wireshark:
23826 0.000065 69.4.231.52 10.10.10.10 HTTP HTTP/1.1 200 OK (video/mp4)

Next go to:
- File
- Export
- Objects
- HTTP
- select Filename: Introduction%20To%20Wireshark.mp4
- hit Save As to save the file