http://store.steampowered.com/app/550/
PSA
According to the Left 4 Dead Blog (http://store.steampowered.com/app/550/), you MUST install the game. It's not clear if claiming the game alone is enough but it couldn't hurt to simply start the download, pausing immediately, and then resuming later.
PSA
According to the Left 4 Dead Blog (http://store.steampowered.com/app/550/), you MUST install the game. It's not clear if claiming the game alone is enough but it couldn't hurt to simply start the download, pausing immediately, and then resuming later.
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