Your license number appears on your distribution disk(s) and on the opening screen (as the full version.license #) when SARApAid is started.  You can also recall this screen after program start by selecting Help | About SARApAid from the menu bar.

The red arrow on the graphic below shows you where to find your license number on the opening screen.  Include all 8 digits and all periods exactly as shown when asked to include your license number.