Most modern mods require the Gathering Storm or Rise and Fall expansions.
Ensure the path looks like .../Mods/xxxivilization-sd/xxxivilization-sd.modinfo . If there is a nested folder (e.g., Mods/xxxivilization-sd/xxxivilization-sd/ ), the game may not detect it. Launch Civilization. From the Main Menu, navigate to Additional Content > Mods . Find xxxivilization-sd in the list. Ensure the checkbox is marked as Enabled . xxxivilization-sd-25.04.zip
A legal copy installed via Steam or the Epic Games Store . Most modern mods require the Gathering Storm or