F.E.A.R.
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F.E.A.R. Online. How to install.
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Links for installation of unsupported game and one DLC
   
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Free download from Steam
For WINDOWS:
Press "WinKey+R" to call "Run..." program

Paste this for F.E.A.R. Online[steamdb.info]
steam://install/223650/
And "Enter"

Paste this for DLC - F.E.A.R. Online: Operation Plan x 5[steamdb.info]
steam://install/327850
And "Enter"

Or just press little green button "Free" at steamdb site...

Simple.
Now you have unsupported game.
Congrats.