Hello. I started a continuous game where the winning conditions are building the imperial cathedral and the sultan's mosque.

Is there a way to change the winning conditions to add having 5000 Noblemen? I tried editing the savegame, after read about that in the Anno 1404 Wiki Fandom, but every time i tried to load the game, I got an error while reading the edited savegame.

I have read that savegames are somehow protected to avoid editing, so, will it be impossible to change the winning conditions after all?

Thanks