Remember back in November 2001, when S.T.A.L.K.E.R. was announced, and quickly became one of the most anticipated PC games at the time? You may then recall several delays thanks to numerous setbacks, including a pre-alpha build leak of the game in December of 2003. More setbacks and more delays meant the game was finally released in March of 2007. Now you can play S.T.A.L.K.E.R. as it was envisioned in 2004 thanks to developer GSC.
Once S.T.A.L.K.E.R was finally released, many things such as vehicles, RPG elements, and advanced AI had either been changed, altered, or just completely cut in the final release. The physics engine was also completely redone, and needless to say, many people were disappointed as they had expected much more. So have you ever wondered what the game could have been if it was released when it was supposed to be? Now you can check out a fully playable Build Version numbered 1935 from 2004, which contains all of the original levels plus some that were cut.
Screenshot: Build 1935 Screnshot
The installation instructions are simply " Delete the savedgames folder and run run_alife_s.bat."
Naturally, GSC takes no responsibilities or guarantees how the game will run, will not answer any questions or provide technical support on the build itself, so try it at your own risk. I think it is safe to say many people are will to take that risk to see the original vision of the game in action.
Detailed information about the release, which includes the installation instructions I posted above, can be found at the following URL.
Link: Post on the GSC forums, which also has a links to FAQ's about the build.
Thanks to Todd (LOC) & Chode for the heads up.