The annoying part is that you have to jump through cookie hoops to get the file, even though pro design appears to be affiliated with Adobe. Adobe does run a "hidden" FTP with installers for everything back to like version 9 of the software in the suite (excepting, for some odd reason, CS 5.5).
This was the first thing that came to my mind as well. Its not terribly hard to find the trial version downloads of any old Adobe software available from Adobe or an Adobe subsidiary online. Not sure why the customer service rep. didn't just suggest this in the first place.
All you need to do after that is insert your Student and Teacher serial number.