If it just installs Steam I wonder if it's just as well to buy it from Steam?
FWIW my steam install activated today, and it was pretty straight forward (a lot like what guod just posted). Put another way, there was no drama with the steam instal.
Also, as a side note, my settings came in defaulted to the exact same values as Guods post, except with resolution (correctly) detected at 1920x1080@ 60hrz. It actually ran better that I thought it would, but there's still too much stuttering around other planes for accurate gunnery.
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My Rig:AMD Phenom X4 955 Black Edition OCed@4.0 GHz/GIGABYTE GA-890FXA-UD5 AM3 AMD 890FX Mobo\ MSi AMD 6950 2GB \ 8 Gigs of G.skills Ram\Storage: OCZ SSD 240GB/ Bunch of HDDs\All held together by: Coolermaster HAF 932 case
Other Assets Deployed:
HOTAS:
Logitech G940 
CH FighterStick/Pro-Throttle/Throttle Quad/Saitek Combat Rudder Pedals
TrackIR
Simpit: ETA Q2 2013
Wheel: ETA Q4 2013