This refers to the legendary game . If you are looking for this specific patch, here is a helpful breakdown of why you might need it and how to handle it. Understanding Patch 1.0001 for S.T.A.L.K.E.R.
The installer needs to find the game in your Windows Registry. If you are using a "repack," the official patcher might not see the game. Pro-Tip: Should you go higher? This refers to the legendary game
Sometimes players "roll back" to 1.0001 before stepping up to a specific mid-tier patch like 1.0004. 2. Where to Download This refers to the legendary game