https://www.gamespot.com/articles/big-free-update-for-pcs-galactic-civilizations-3-a/1100-6453268/

The latest update for Galactic Civilizations III is now available, and developer Stardock describes it as making "some massive engine enhancements." It arrives for free for everyone, with those who own only the base game in particular seeing a large number of changes.

Among the changes in update 2.5 for those with only the base game are some of the enhancements introduced in the Crusade expansion earlier this year. That includes its refined UI and better AI, which are things that Stardock now says it doesn't want to have restricted to an expansion. "I view Crusade as practically a sequel to the base game, not just an expansion," said CEO Brad Wardell in a press release. "We really don't want to get into the business of charging money for AI and engine upgrades, so we'll continue to improve both games in order to achieve the best possible results."