Disclaimer: The tutorials are outdated. They should be used to improve yourself and not to judge other players by. Keep in mind that some technical explanations have become obsolete. These demos were meant to offer people literature to watch before they attended classes and practiced with others. The file which you can download is about 700 MB in size and contains demos, maps, an outdated version of sil's mod, plus some optional files. You will need to use the timescale command to skip parts of the demos and/or to speed them up. This is all explained in the readme.txt file.