As said, if you use Caveman2Cosmos 40.1 then download UEM 4.1 map and start a new game. If you use Caveman2Cosmos SVN then download UEM 4.3 map and start a new game. If you want to use the latest Caveman2Cosmos version install SVN. Caveman2Cosmos SVN setup: SVN: https://github.com/caveman2cosmos/Caveman2Cosmos/wiki/Using-SVN INSTALLATION AND USAGE: NOTE if you use C2C 40.1 you need UEM 4.1 if you use the latest C2C version via SVN or a higher version above C2C 40.1 then you can use UEM 4.3+ maps/scenarios: Get and download the Caveman2Cosmos mod, then: 1. Unzip or copy the file C2C-UEM-ByPit2015-V4.3 to ...\Documents\My Games\beyond the sword\Saves\WorldBuilder 2. RECOMMEND: If you use steam, use Civilization IV: Beyond the Sword Beta "Original release" in Betas in steam. 3. Start Beyond the Sword select "Advanced" then "Load a Mod" Load the Caveman2Cosmos mod. Select Single Player then select "Play a Scenario", choose the scenario C2C-UEM-ByPit2015-V4.3 and start it. Play this scenario in eternity speed, otherwise you will get technologys to fast in later game when you manage to grow big. Highest difficulty level recommended for this scenario/map. Make sure to play on Deity and Eternity game speed, otherwise you get techs to fast. Please clear the cache folder before you start a new game. This removes the old cached data from your previously played C2C version and will help eliminate conflicts and oddities. This is the Path to the proper cache folder to clear (delete contents) for Win 10 users: C:\Users\"Username"\AppData\Local\My Games\Beyond the Sword\cache Also turn off damaging terrain in BUG on new games. Game on, have fun.