Welcome to the forums.
If I remember correctly, some versions seem to require the Company box to be filled in - just enter 'home' for that if that's the case. Also make sure you have something entered under Name, and that you haven't mistyped your serial number.
A note though - once you have installed it, you will need to register your serial number(s) with N3V. To do this, click Planet Auran in the menu above, then click Serial Number on the left-hand side menu, then fill in the form that appears.
Shane
EDIT: I notice you mention 2-pack. If that's the TS2009 and TS2010 pack, make sure you aren't trying to use your TS2009 serial in the TS2010 installer or vice versa.