Run one installer at a time, start with 'part 1 of 2'. This is one of my 'click through' installations, it comes in two parts due to the file size restriction of the installer application. 3 New 4.0 version is out! me on Patreon: me on Twi. There you will find all your installed Kingdoms campaigns as well as the Third_Age_3 modfolder. Open Steam/Steamapps/Common/Medieval II Total War/ mods. Install all parts of the mod as instructed above.
Additional installation instructions only for Steam users: 1. Subscribe to my new channel! - Start the mod with the 'Third Age - Total War' shortcut on your desktop.