Includes 3 items: S.T.A.L.K.E.R.: Call of Pripyat, S.T.A.L.K.E.R.: Clear Sky, S.T.A.L.K.E.R.: Shadow of Chernobyl...
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Didn't try it myself (yet) but you probably just follow the readme like on windows.
Install the game via steam, extract the .zip and copy/paste the contents to the gamefolder, make sure to overwrite the existing files
Set launch options to -smap4096 -nointro -nocache -noprefetch and you're probably good to go
There is a mod that tries to achieve this goal, it is called
Call of Chernobyl
Otherwise I can recommend you to take a look at
Anomaly and
G.A.M.M.A.