This is a scenario pack containing five scenarios. Earth 2012 AD and Earth 1970 AD are basically finished, while Americas 1474 AD, US 1861 AD, Europe 800 AD, and Expanded Earth 1000 AD are close to being finished. Earth 1600 AD is still under construction. To discuss the scenarios, click here.
The file is a zip file, to open it, extract it to your desktop. If you have Windows 7, put the file CivGameCore.dll into the Assets folder and the Earth Sometime AD map files into the public maps folder. Then put the file in My Computer>OS>Program Files>Firaxis Games>Sid Meier's Civilization 4>Beyond the Sword>Mods. You will need administrator privileges to download the mod here.