https://wccftech.com/new-halo-mcc-patch-july-14-halo3/

A new Halo MCC patch is being rolled out today across PC and Xbox One and we’ve got you covered with the full release notes.

The update is being deployed alongside today’s Halo 3 for PC, and weighs in at roughly 20.84GB through the Microsoft Store and Game Pass. Those owning the Collection on Steam will be presented with a 17.6GB update, while Xbox One owners will have to download roughly 23GB of data. Alongside support for Halo 3 on PC, the new update offers various new features and community fixes across all platforms for Halo: Combat Evolved, Halo: Reach, Halo 2, and Halo 3.