Make sure to update your 7-zip as older version of 7-zip will corrupt the archives. The entire modification comes in a 7-zip archive. You need Visual C++ Redist 2013 x86, if game fails to launch due to missing msvcr120.dll Since textures *.db use over 2GB, it made more sense to just repack the modification rather than having a 2GB sized cumulative patch.
This repack contains many texture optimizations and *.thm fixes over 1.4. Overwriting without deletion will cause the engine to load that older 5th texture db file. Call of Chernobyl\database directory before overwriting the existing install of CoC with this repack!! This is because about 500+ mb size was cut from textures, meaning there are four textures.db# instead of five.
If you have an existing install of 1.4, delete S.T.A.L.K.E.R. It is standalone, please do not install it over Call of Pripyat or any other stalker game.
Please do not try to install it over older versions. 1.4.12 is a new repack of the modification.