GOG.com is a website you buy games from, like steam.
I do not know what you mean. Maybe it's the language. I have only 1 Warriors of the north folder. This one:
http://i.imgur.com/gH5E9u5.png
This is where the game is. I clicked the .exe file and it worked(now it doesn't work anymore)
I downloaded the file you linked, and copied the files there. what did I do wrong? I can't copy in main file without replacing normal game files.
I installed this mod and it worked on crosswrolds:
http://forum.1cpublishing.eu/showthread.php?t=190104
SO I don't know what I am doing wrong.