Installation normale :

You have to unrar the main mod file.

Once you have the '1200 Europe' folder you have to place it under Mount&Blade Warband/Modules. The game folder 'Mount&Blade' is usually installed and therefore located under Program Files, though you might have it installed in another place.

Once the module folder is under 'Modules' just click on the Mount&Blade Warband desktop shortcut or exe and get to the first menu that appears in the centre of your desktop. In the upper part you have 'Current Module', were you can choose the module you want to play. Native is the original module (the one that comes with the game), just select 'Europe 1200' and click on 'Play Mount&Blade Warband'. And Enjoy!


Installation Steam :

MAKING MODS WORK WITH STEAM
Steam isn't mod-friendly. But there is a way to have it ok even if you have it installed as Steam. You need to see the game's code on your game's profile on your Steam library, and use it to unlock the complete game after downloading and installing the version from Taleworlds' page.Note: You need to see the code on the library cause the code on your game box can only be used to instal the game on Steam. That way you have the same Warband, but running perfectly with mods. Of course, you wouldn't have the scores and tropheys from Steam. But you wouldn't miss them after playing all the mods out there.
Once you have the game ready, you can instal the mod.

INSTALLATION INSTRUCTIONS

You have to unrar the main mod file.

Once you have the '1200 Europe' folder you have to place it under Mount&Blade Warband/Modules. The game folder 'Mount&Blade' is usually installed and therefore located under Program Files, though you might have installed in another place.Once the module folder is under 'Modules' just click on the Mount&Blade Warband desktop shortcut or exe and get to the first menu that appears in the centre of your desktop. In the upper part you have 'Current Module', were you can choose the module you want to play. Native is the original module (the one that comes with the game), just select 'Europe 1200' and click on 'Play Mount&Blade Warband'. And Enjoy!