S.T.A.L.K.E.R.: Clear Sky
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Buy cheapest CD keys on online shops and download your game for free through the seller or editor.
Use your CD key on Steam to download S.T.A.L.K.E.R.: Clear Sky.
Use your S.T.A.L.K.E.R.: Clear Sky cd key and download your game on GOG GALAXY
S.T.A.L.K.E.R.: Clear Sky
GOG GALAXY is a fully optional client to install, play, and update your games. It also offers online multiplayer, achievements, chat, game-time tracking and more - but it’s up to you which features you want to use.
You can download your game using the CD Key on the retailer or publisher website. Please follow the steps and instructions given by the retailer.
For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your CD Key. Thus, the game will be activated and automatically added to your account library.
