It is freeware but you have to have the retail version of Half-Life. You can also buy it because its a pretty big file to download off the internet-80MB.
If you have Half-Life, just download the CS mod from the official website. Otherwise, you can buy the standalone version (looks like a yellow Half-Life box) or as part of a HL bundle (Game of the Year edition I think has it -- there's one out there with multiple mods/add-ons).
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