|Maybe this is how Youtube got a concussion?|
First of all, using torrents to share content is 100% legal, it is sharing copyright content which is not. Using torrents you will download from multiple sources instead of a single one, giving you much faster download speeds. A whoppy 10 gigabyte collection like Chris' ultrasound videos thus can easily be downloaded in 30-60mins.
First you'll need a torrent software client. uTorrent has a good reputation and has all the features needed, it's free so go and install it.
Then you need the torrent file which has the description of the contents and where to look for it. You could google something like "irvine ultrasound torrent" but there are some other similiar torrent files out there which do not include the whole 10gb package. Also, there are many bad torrent websites forcing ads and even bloatware on your computer, thus I recommend www.isohunt.com which I find better than the others and have used for a while. You can also download the file directly from my Dropbox here
That's all there is to it. Open the torrent file in uTorrent and it takes care of the rest. Remember, torrents live only as long as those who have already downloaded continue sharing them. Please keep your connection open, you can set a max upload rate in the torrent program so that your Internet connection isn't clogged.