Steam is the best, buy through that.
http://store.steampowered.com/app/10/
steampowered.com download steam client and you can get the game from them there.
Counter-Strike games are available to download via Steam.
Download steam from steampowered.com and search for counter-strike source
On the Steam "Games" tab, click "Activate a product on Steam...".
Steam.
On steam.
To download counter strike source first install Steam at Steam com. then search up Counter Strike Source. it will be in a package with garrys mod, you can buy them both separately or together for £15.00
you can go to steampowered.com and download steam client and you can select their online steam store and you can download many games including Counter strike Source CZ and 1.6
Steam automatically patches the game.
You get the steam client from steampowered.com look up counter strike on their online store download it and you can start the game from your game library.
Log into your steam client, and redownload.
No, CS:CZ is a Steam game.