If you have already purchased SLmail and have your serial number and authorization code, select the Register option on the Enable Product screen to register it now. Click Enable, and the screen illustrated below will appear.
SLmail Installation Permanently Enable Product dialog box
Enter the Serial Number and Authorization Code in the provided fields. Then click Register to continue installation.
Note: Keep a hard copy of your serial number and authorization code in a safe place. You must have them to reinstall or upgrade SLmail.