[2020] I just bought the Halo: Combat Evolved DLC on MCC. Gotta day, they did a good job on that game. Hats off to Microsoft.

For PC, you can purchase an MCC 'bundle' which will come with every game as they're released or you can buy each title individually as they release. I assume this post is referring to MCC on PC and the release of H:CEA yesterday. :)