An extension of K-Mod. The bulk of the changes concern the AI; a few balance changes; practically no flavor changes; no added content. The mod hasn't been properly tested in multiplayer.
Rewrite of the AI parts dealing with decisions on war and peace; revision of AI relations modifiers; minor rules and balance changes to address loopholes; overhaul of Barbarian placement; culture of dead civs stays in the game; misc. AI and usability improvements; game options "Start Points as Handicap" (Advanced Start only for AI-controlled civs) and "Rise & Fall" (periodically take over a different civ from the AI).
Please refer to the manual (not included in the main download) and the development thread for more information.
Copy the unzipped AdvCiv folder into Beyond the Sword\Mods under Program Files. When the mod is loaded for the first time, it creates a folder My Games\Beyond the Sword\AdvCiv for the BUG settings. You'll have to remove this folder manually to fully uninstall AdvCiv.
The above assumes a BtS installation from optical disc on Windows 8 or earlier, though I understand that it works the same way with the GOG.com edition and on Windows 10. Steam users may have to revert to the Game Spy version in order to run any mods, and the Mods folder should be in Steamapps\Common\Sid Meier's Civilization IV Beyond the Sword\Beyond the Sword. There is no way to play this mod on macOS except through a Windows emulator (this guide might help with that, but I haven't tried it).
To start the mod through a Windows shortcut, create a shortcut to Civ4BeyondSword.exe, open the shortcut's file properties, and add a space and mod=\AdvCiv to the Target field.
Advanced Civ 0.94
Aiming at challenging, non-degenerate gameplay; based on K-Mod.