Automatically, you download a map from a server playing that map. Otherwise, you can download maps from FPSBanana (link below).
Note: Counter-Strike 1.6 and Condition Zero maps work interchangeably.
You can download Counter-Strike Condition Zero (custom) maps from Gamebanana.com Just find a desired map, find the download option, and you should have the downloaded map in no time!
Download a map and add it to your "maps" folder within your "cstrike" directory.
You can download the latest Counter Strike, at store.steampowered.com
Counter-Strike 1.6 Counter-Strike: Condition Zero Counter-Strike: Source
Counter-Strike games are available to download via Steam.
Softonic has it if you just google Counter-Strike Extreme.
Type in : Download Free Counter Strike (version)
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Download steam from steampowered.com and search for counter-strike source
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Steam.
On the internet.