"Age of Empires IV v5.1.148.0.part03.rar" is the third segment of a split-volume archive, requiring all associated parts to install the December 2022, Season Three stability update. This patch (5.1.148.0) specifically brought balance adjustments to the Malian and Ottoman civilizations, along with map pool updates and performance fixes. Read the full patch notes on the Age of Empires website . Age of Empires IV - Patch Preview 5.1.148