2) Update your game to version 1.0.1.6 (the last version that is compatible with these beta builds of Counter-Strike)
3) Download the releases of Counter-Strike you desire below.
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Alternatively, you can download this archive on [MEGA](#) which contains Half-Life 1 already patched to this version, as well as containing all major builds of Counter-Strike (Beta 1.1, 2.1, 3.1, 4.1, 5.2, 6.1).