African_wildlife: Does the 1.0005 patch on PC Gaming Wiki work?

Issar077: EDIT Rewritten 15/02/14 for more complete and concise instructions.
Mods for STALKER games are quiet patch version dependent. The GOG version of Shadow of Chernobyl comes pre-patched to v1.0006. This patch wasn't widely used by the modding community for various reasons. So to play a large number of mods you will need to downgrade your game to either v1.0004 or v1.0005.

To downgrade to v1.0005 you need to download the US v1.0005 patch which can be found here.
www.gamershell.com/download_21947.shtml
Note: You MUST use the US version! All other versions of the patches still contain the DRM(disk check). ONLY the US version is DRM free. The WorldWide patches will mess up your XR_3DA.exe and the game won't run without a disk, which you obviously don't have ;)

Once you have it you'll have to change some registry values
Warning: Please DO NOT edit anything in the registry unless instructed to do so. Incorrect editing of the registry can seriously damage your OS. Requiring a complete re-install to fix!

1. Press win key + R and type "Regedit" hit ok.
2. Navigate to Path: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\GSC Game World\STALKER-SHOC (For 64-Bit systems, 32-Bit seems to be missing the Wow6432Node subfolder, but haven't tested this)
3.Change the following values by right clicking on the heading and selecting modify, then clicking OK
(See Screens)
- InstallLang = en
(Is case sensitive! The patches install language)
- InstallVers= 1.0004
(This tricks the patch into thinking you have v1.0004 installed)
- InstallSource = stk-for-pack-noprot-efis
(This will make sure that the installer will recognize a US version of the game which will allow you to install the patch)
Close the window.
(All settings are saved on exit)

Now you should be able to install the US v1.0005 patch .
Note: You will get a runtime error about not being able to find the read me. Just ignore it ;)
However it will install under
C:\Program Files (x86)\THQ\S.T.A.L.K.E.R. - Shadow of Chernobyl
(At least that is what happened on my computer).
Therefore you need to copy the files manually from that patch installation directory to the GoG Install directory.

You will also need to delete the following files from the GoG Install directory based on which patch you just downgraded to.
For patch v1.0005 delete gamedata.dbd (this is installed by v1.0006)
For patch v1.0004 delete gamedata.dbb, gamedata.dbc (these are added by v1.0005)
If done correctly your game will now be patched to V1.0005 and you can install all those awesome mods :)

For downgrading to v1.0004. Just replace
- InstallVers= 1.0004
with
- InstallVers= 1.0003
and use the v1.0004 US patch.

Last of all go to control panel - programs and features and uninstall the patch.
(you don't need it installed after copying the files to the GOG game directory.)

I'd like to thank the user "TheMechanist" on the following thread for his original instructions without which i wouldn't of known where to start.
www.gog.com/forum/stalker_series/soc_v10006