Just follow what the large companies do. Come up wth a "new version" of the software and then say you will stop supporting the old one in....... Works for windows!!!!! try getting support updates for windows 95!!!!

a fellow instructor friend recommended this a few years ago. www.floppix.com it is linux on 2 floppies!! its made off of debian. but never mind booting off floppy.... you can use any live cd for linux but the website has labs for beginners and common commands. check it out, great for new users