How to install Halo 2 classic as part of the MCC?

[Uber Conan]

I've seen plenty of references to Halo 2 classic, but all I see is the Anniversary version. I'm able to create custom multiplayer for H2 classic, but no idea how to install or access the campaign, and only Halo 2's Anniversary version shows up in the game DLC.

Any help is appreciated.

[Snark]

Press TAB while in game. It will change to classic graphics.

[Uber Conan]

Thanks! That doesn't get it to work for the He's Running a Marathon... achievement, but it definitely provides the Halo 2 classic experience.