http://www.twcenter.net/forums/downl...o=file&id=3607
This one works with normal ModManager on Steam, then keep in Steam\steamapps\common\Total War SHOGUN 2\data the pack that features the faction you want to play.
Main factions(Tokugawa, Ishida, Ukita...) are pack 1: The_Sekigahara_Campaign_v0.95a_Faction_Pack_1
You need to remove the two other faction packs.