First of all: DOWNLOAD ALL THE PARTS!!!
1)Download the PARTS!
2)Extract each PART.
3)Go to you Modules directory(e.g. C:\Program Files\Mount adn Blade Warband\Modules)
4)In your Modules folder, CREATE a folder named Out of Darkness.
5)Inside this newly created folder(Out of Darkness) copy all the contents of the extracted PARTS. You know, there should be in there Textures folder, Recource folder, lots of .txt files, Data folder and so on.
6)Start your Warband Launcher, select Out of Darkness as a Module to play and that's it. Enjoy!
The reason for these Parts is that the Mod is quite large as a file and also, my Internet connection sucks and I could not upload one big file at once, but smaller files. Sorry for all the inconvenience that has been caused by that.