: Unlocking higher-tier buildings now requires "Prosperity," a score calculated based on wealth, territory, population, trade, splendor, and beautification. The Crown Jewel: The Monastery
The progression system was rebuilt from the ground up to add strategic weight to your choices. Foundation.v1.9.1.3.0112-GOG.zip
For players managing this GOG version, ensure you are running it through the GOG Galaxy client to receive the latest hotfixes automatically, as the v1.9 branch received several subsequent stability patches (up to 1.9.7) before the game's full 1.0 release in January 2025. Foundation.v1.9.1.3.0112-GOG.zip