Left 4 Dead » How to play L4D 1.0.0.5 online?

Hi,

I downloaded the game from a torrent website, and I tried to connect to servers, but that doesn't work.
What must I do to play online?

I didn't find the right solution from the internet.

References: https://www.gametracker.com/games/l4d/forum.php?thread=98510



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