Afaik, 3.2.2 was never officially released.
The link says 3.2, not 3.2.2.
And the videos were made in 2008; the latest version at the time was 3.0.2 SP1. It says so right in the very first screen of the first video.
In fact, a few things have changed since the videos were made, most notably the audio system.
I'd stick with 3.2.1 for now, switching to a newer version from that should be no problem at all. Changes since then have been mostly cosmetic, afaik.