At work not but im sure it is C>>>Program Files>>>Steam>>>Counter Strike>>>Counter Strike CZ and all files will be there.
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By default the mod folder is: C:\Program Files\Valve\Steam\steamapps\<username>\Condition Zero\czero <username> = steam account username
Softonic has it if you just google Counter-Strike Extreme.
Counter Strike: Source uses the Source engine.
Download Counter Strike Source. Play Counter Strike Source. Delete Counter Strike 1.6 It's 2012 for christ sakes.
steampowered.com download the client and you can find the game there to purchase and get virtual disk download other then that its hard to find it in stores.