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What is needed many times is a restart of Steam, so that the DLC is "read" in your library and activated.
Try restarting Steam and launching the game.
The last time you bought a game with this account was in 2009 - the day you made the account.
You haven't bought any other base games since then?
You mentioned you got a key in some email.... Steam will not give you a key in any email... it will automatically be linked to your account if you bought it on steam..
If you did not buy it on steam and you got a key then you need to activate that key on steam if it is a steam key.
(Do not post the key on the forums)