If this helps, when I go into custom game to choose ESF I look at CS at it says 1.1 , I think thats something to do with it because like Zodiac said you get 1.0.0.5 for retail cs and ESF is 1.0 .
You need this to play Half-Life and ESF online. If you have Half-Life installed on your computer already, which you should, when you install the patch, when the install path comes up, it should already be in the spot that you installed Half-Life to.
As the same for Counter Strike.
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