All steam functions should work without the need to run Steam in admin mode which is epic.
Now just can boot up the game from Steam and it will execute the correct.
Alright final step, rename the Gunslinger exe named "Play GUNSLINGER Mod.exe" to "Stalker-COP" making sure you use this name exactly.
Once the game loads to the menu simply Exit to Windows.
Next run Gunslinger from the CoP folder (Play GUNSLINGER Mod.exe).
If the previous steps have been done correctly then your CoP directory should look like this (with Gunslinger correctly installed):.
The folder path in the installer should look similar to this:.
This folder contains all of the base game data that we moved previously in step three.
Now change the CoP folder location to our newly created "Stalker Call of Pripyat" folder found in the base game directory (Steam/steamapps/common/Stalker Call of Pripyat/Stalker Call of Pripyat).
A window popup saying "The selected directory is not empty" will open, hit "Yes".
CALL OF PRIPYAT GUIDE INSTALL
Change the install directory for Gunslinger to your Original CoP Folder (Steam/steamapps/common/Stalker Call of Pripyat).
Move the entire contents of your CoP folder into our newly created "Stalker Call of Pripyat" folder.
Within your CoP folder create a new folder and name it "Stalker Call of Pripyat".
Locate your CoP folder in your Steam/Steamapps/Common folder found on your selected installation drive.