I'm pretty sure I bought it online from Amazon.
When you start the game do you see a check for updates button?
I honestly don't know how amazon handles its digital games.. but I know for example the steam version must be updated through steam. AFAIK other copies get an update button on the main menu in game when they aren't up to date.
You can download them manually as well. But you need update 2 before you install update 2.2http://www.battlegoat.com/downloads/SRC ... -7-2-1.exe
<--- update 2
If that one tells you there is nothing to install then you either have a steam version, or amazon has its own patching process like steam.
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