First download the 3 files using the links in download section. You will need 7zip (free) to extract them so make sure you have installed it.
Extract only part 1 on your desktop. 7zip will extract automatically the rest 2 and will build the setups file.M ake sure that in your mp_eur_napoleon there are vanilla startpos.esf and scripting.lua. This is needed so installer can take a backup for restoring those files after a multiplayer game. Now run setup file follow instructions. Make sure that you are installing mod in your ...\napoleon total war\ directory.
Mod is a click 'n play, that means that when you start Orient launcher it will update user script automatically. When you finish and close launcher it erases the mod commands from user script and removes mod files. In other words, if you do not play mod your game installation will be in vanilla "mode". If the player has not user script it creates it and then adds commands. It has no effect to commands of other mods that might be in user script.
Give launcher all the time it needs to load mod file since some files are really large. Never close launcher if you haven't first close the game.
If game freezes in first screen, and only in that case, install the FIX you'll find here following instructions.