Updates and Downloads

Demo
Download the Civilization IV demo and play through 100 turns with the Incan, Greek, Roman, and Indian Empires.
Download the Demo from 2k games (314 MB)
Official Trailer
Windows Media Player640x360: View Now Download (13.1 MB)432x240: View Now Download (7.29 MB)
Quicktime640x360: View Now Download (18 MB)432x240: View Now Download (8.11 MB)

Patches
v1.61 Patch
v1.61 is a major upgrade to Civ IV and includes number of new and exciting features including new scenarios and map scripts, unit adjustments and enhancements and more!
Note: This patch is for all versions of Civilization IV with the exception of the Direct2Drive version.
Download the patch from 2k games (45.7 MB)Click Here to view the complete list of updates.
Improving Movie Playback (1.61 Patch)
If you are still experiencing stuttering or slow movie playback after the 1.61 patch, try the following:
Open the config (ini) file in notepad, and find the line which reads HideMovieBackground = 0, set it to HideMovieBackground = 1
The intro and victory movies expand to fill the screen, so play the game at lower resolutions (like 1024x768) to get the best performance.
If that doesn't help, a set of lower resolution movies will be available for download here:
Intro Movies (low res) (68 MB)Victory Movies (low res) (40.1 MB)Wonder Movies (low res) (271 MB)
Software Development Kit
Download the Civilization IV Software Development Kit, which contains the core game DLL source code, allowing gamers to completely rewrite or modify their own Civilization world to their heart's content.
Download the SDK from 2k games (6 MB)
PitBoss Application
The PitBoss is a unique application allowing the epic nature of Civilization to finally be easily integrated into the multiplayer realm. It is a lightweight application with a simple interface. While running, players will be able to log in and continue their progress in a game at any time. Once satisfied, players are welcome to log out and continue later.
Download the Pitboss Application from 2k games (3.46 MB)Click Here for More Details on the Pitboss Application.