No activation code found


I have bought a Lexicon Alpha Desktop Recording which come with cubase LE 5.
I am not able to register my licence.
The eLicencer does not contain a license. On the FAQ they say that I should enter the Activation Code manually but I have no activation code any where?
The only code that I have is a serial number which is of the form
and it does not fit in the Enter Activation Code of the eLicencer.

How can I do?
Thank you