Download of S.T.A.L.K.E.R 2.0 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
Commonly, this program's installer has the following filenames: S.T.A.L.K.E.R.exe, setup-bp.exe, Stalker-COP.exe, STALKER.exe and xrEngine.exe etc. The most popular version among S.T.A.L.K.E.R users is 1.0.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. S.T.A.L.K.E.R lies within Games, more precisely Adventure. This program is an intellectual property of GSC Game World.
From the developer:
The events of S.T.A.L.K.E.R.: Call of Pripyat unfold shortly after the end of S.T.A.L.K.E.R.: Shadow of Chernobyl. According to the operation's plan, the first military group is to conduct an air scouting of the territory to map out the detailed layouts of anomalous fields location.
You may want to check out more software, such as Cute Knight Deluxe, Brave Soul or NexusTK, which might be related to S.T.A.L.K.E.R.