LaserSoft Imaging

Along with my Epson scanner, I received software for Silverfast but I cannot find a serial number anywhere. If I use Silverfats in demo mode, the image is covered with Lasersoft logos. Where do I find a serial number? or, how do I get rid of the logos? Thanks.

The serial should be on the bookled on the back. It is a little sticker with the serial with 20 digits.