I have a working "1.6 ST" version of OSTicket running. I just downloaded the 1.7.2 zip file and unzipped it so I now have an upload directory full of stuff at the root of the osticket tree. The README.txt says to open the "scp/" page and the upgrade will happen. Nothing happens when I do that other than just getting the normal osticket webpage there. Can somebody clarify how to get the upgrade to run for me please?