The script has been writen for the newer standard (and more secure) register_globals. Second 'The Developer' has replied to 99% of questions and even writen custom versions for users. I applologies if John100 did not recieve a reply, but I did not get the request.
One more thing to note is the version. There are many versions available, some support register_globals ON and some OFF, some user MySQL some don't, some use advanced DHTML.
Finaly, the license allows the user to make custom changes