Is there any way to change victory conditions with the game already started?

Question

Is there any way to change victory conditions of a game already in progress?

Answer 1

There is no way to do that with the base game.

You can do that by using a custom FireTuner panel, as detailed in this thread on civfanatics.com. There's a download link for the panel there, as well as information on how to add this panel to FireTuner and how to use it.

There's also some useful information on that thread for those new to FireTuner:

how i can open/start the tuner????

1. Download "Sid Meier's Civilization V SDK" from Steam (through Library -> Tools)
2. Open up the config.ini file located in your Civ5 user folder (e.g. "C:\Users\Username\Documents\My Games\Sid Meier's Civilization V" on Vista)
3. Look for the line "EnableTuner = 0" and change it to be "EnableTuner = 1" then save changes.
4. Launch Civ V
5. Launch the Tuner from the SDK shortcut of the Steam menu

Be aware that changing victory conditions mid-game might seriously screw with the AI.