Posted by Demonio
Shouldn't it automatically install Northern Strike when you install whatever's on the disc?
Most dvd disc games that include expansions have the Expansion install option grey-ed out on the auto-run menu until you install the main game. Try popping the disc back in and waiting for the auto-run menu.
Posted by Sebhael
It's already on your computer.
It's not a standalone game, it just unlocks more things for your 2142.
As Knitewulf said, the biggest things you will notice until you are a high enough level to unlock the new weapons and items; is that now you can join those 3 new maps.
It's more of a Booster Pack, than an expansion.
It says Northern Strike - Booster Pack, right? It's a booster pack. :)