Lost serial Number

I need to reinstall Spamsieve, I am unable to find my serial number. I have SpamSieved backed up using Time machine. How can I retrieve the serial number or what folder would this be in. The usual process of retrieving on line does not work with several emails address I have tried.

Thank You

The serial number is in SpamSieve’s preferences file, as well as in your order confirmation e-mail. If you can’t find it, e-mail me your name and the e-mail address that you used to place the order, and I’ll look it up.