Go download it while you can. My old 9600Pro came with a CD key for HL2 so once the game is released all I gotta do is put my CD key in and I can play.
Half-Life 2 pre-loading begins to Steam account holders today. Over the coming days, those who have selected the pre-loading option will have encrypted Half-Life 2 files delivered to their PC. No purchase is required to pre-load HL2, but is required to activate the game. Purchase options will be released soon. Then, the moment the game is made available, those who have pre-loaded and purchased Half-Life 2 via Steam will be authenticated and ready to start playing. For more information, please visit www.steampowered.com.
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