Have been playing C2C for a few weeks now and it is truly amazing. Not only has it added great new eras but the array of choice is truly remarkable. Best of all it is still being worked on and updated all the time by a load of people who believe in making CIV into a game I believe many people wished for rather than the dreadful dumbdowned CIV5. The more people support it the better. Downloading it isnt the easiest thing and you need a realtively decent computor to play this mod. You can get C2C V25 by downloading as a torrent and then putting it in your BTS mod folder but I believe the best version is called the SVN download. If you go to the SVN discussion thread on the Caveman2Cosmos it gives instructions on how to download. This version, I believe, gets updated as the developers change things. Dont fully understand it but any questions im sure will be answered on the C2C forums. Join the revolution.