I have a 3 machine license for ZA internet security. I have just bought a new desktop and will be pensioning off my old desktop as soon as the new one is running. The software has already been installed on 3 machines and the new one makes 4. As a result, the system is asking me to purchase a new subscription. The old machine is now switched off, not connected to the WWW and will soon be used as a server for my music. How can I persuade the system that I only have 3 sets of the software running?