The video is available in two versions--the standard version and the "Unrated Director's Cut" with additional scenes ("PG-13" -- randy!). Both a high and low quality version is available, depending on the speed of your connection.
The video can be played with at least version 7 of QuickTime (free download for Mac or Windows), or the free, open source video player VLC (free download for Linux, Mac, or Windows).
Right-click (Control-click on Mac) on the version you want, select the option to download the file to your disk, and enjoy!