1) Download the mod.
2) Extract the Perisno 0.732 folder in the .zip file to anywhere.
3) Move the Perisno 0.732 folder to the location of your Modules folder in your Mount & Blade: Warband directory.
4) Launch the game.
5) Choose Perisno 0.732 from the drop-down box in the game launcher.
6) Play the game.