Third Age: Reforged is a submod for Third Age 3.2 that aims to overhaul the multiplayer aspect of the mod by thoroughly rebalancing the units and factions while also implementing new units, custom scenarios and other features. (NOTE: not playable for campaign).
Important Note: You must have Third Age: Reforged 0.7 and Third Age: Reforged 0.6 installed prior to patching. Also make sure you have WinRAR installed on your computer. This will allow you to extract the downloaded files from their RAR packs.
Step 1: Download Third Age: Reforged 0.8 Patch.
Step 2: Double-click the downloaded file top open it. Now click the Extract To button in the top left corner of the WinRAR window. Now navigate and extract to the following path:
\Steam\steamapps\common\Medieval II Total War\mods
Note: If it does not ask you to overwrite anything, you did it incorrectly.
Step 3: To launch the game, use the Third Age Reforged.bat file. Simply launch the Third Age Reforged.bat file in order to launch the game and mod. This should work for Steam and Non-Steam users alike.