I suspect this was before Richard started creating Zip Archives of the videos and databases. As long as it's a video stored on he server, you can right-click the individual videos in the video window and choose "Save Video As" to download individual videos to your hard drive.

If it's a video that's only stored on YouTube, then you have to be a YouTube paid member to download content typically.

Yeah, zipping them up is a manual process, and to be honest, I can see from the logs that a very small percentage of people actually download the zip files. Most people just watch it online. For a lot of the lesser popular seminars like this one, I didn't bother zipping them up. If there's something that you'd like to see zipped up and it isn't, let me know. When I get some time, I can make a zip file for you.