To install:<br />

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Copy 'gamedata' folder from Clear Sky Complete archive to main S.T.A.L.K.E.R.: Clear Sky directory (the whole folder, not just its content).<br />

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Default directory:<br />

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C:Program FilesDeep SilverS.T.A.L.K.E.R.: Clear Sky<br />

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Steam default directory:<br />

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C:Program FilesSteamsteamappscommonstalker clear sky<br />

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To uninstall:<br />

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Delete or rename 'gamedata'