If you are a registered user of 1st Security Center Pro you may upgrade at no charge to any newer release. Just download the latest shareware release of 1st Security Center Pro and install it without uninstalling the previous version (don't forget close previous version of 1st Security Center Pro if running). This will preserve your registration. If the registration code is no longer present on your system just re-enter it like the first time and restart the program.
You can download the latest shareware release of 1st Security Center Pro from downloads page