How can I tell which version of Civ I have?
When you run Civ it asks various setup questions. The version number is on these screens. The number is 474 plus an increment, so v5 is shown as 474.05. If you have an older version, you can get the latest version by anonymous FTP from some of the big game sources such as ftp.uwp.edu. Note: Version numbers may be 475.X or 474.X, with the only difference being the distribution media.