This is a beta of Release 4.0 of Colonialism 1600AD so it will be further improved when I have time. Colonialism 1600AD is a 17th century mod for Empire Total War.
Install as follows:
1.Place user.empire_script in C:\Users\yourusername\AppData\Roaming\The Creative Assembly\Empire\scripts. Delete the previous scripts already located there first. Most problems people have had are because of not performing this step properly.
2. Place 1600_naval_007.pack, Col_loc_en.pack, Col_music, Col_scripts, Col_models.pack, Col_ui.pack, colmod.pack, Colo_events.pack, Pikeman_animation_MOD.pack, and patch_general_andy's_musket_sounds.pack in the Data folder.
The Data folder can be found in C:\Program Files (x86)\Steam\SteamApps\common\Empire Total War\data.
3. If "new.pack" is already in your Data folder, delete it.
4. Next place startpos.esf in C:\Program Files (x86)\Steam\SteamApps\common\Empire Total War\data\campaigns\main.
Now start Empire Total War as normal through Steam. Do not use Modmanager as this may prevent the faction specific generals from working. NB there seems to be a conflict between 1600_naval_007.pack and the custom campaign map models, and it prevents the models being faction specific on the campaign map. You can solve this problem by deleting 1600_naval_007.pack, and deleting the entry for it in the user.empire_script (using Notepad) and saving.