For the serial number to correctly work, you need to first enter
the game and go to 'register.'  Once there, there is a registration
code (ex. 54:6F:32:76:34:F3:4F:AA:01:55).  In Keygen 2.0.4, you need
to enter that code EXACTLY as is is shown (with the colons).  The
number generated is the correct registration number.

-Vigilante