Install G.A.M.M.A following standard instructions. Open mod launcher.

1.) Select button under "Run" that says "Shortcut", then click "Desktop" to add the shortcut to your desktop. The folder will be automatically create Anomaly launcher.

2.) Install S.T.A.L.K.E.R.: Call of Pripyat

3.) Right click on S.T.A.L.K.E.R.: Call of Pripyat at steam library, select "properties" and add new path to launch

4.) After standart instal of G.A.M.M.A it should look like

Z:\GAMMAFILES\ModOrganizer.exe "moshortcut://:Anomaly (DX11-AVX)" %command%

Just copy and change the name of your disk and folder with the G.A.M.M.A mod to your own.

The name of the folder with the G.A.M.M.A mod must be written without spaces

Launch G.A.M.M.A using S.T.A.L.K.E.R.: Call of Pripy via steam.