That's CMT v3, right? Anyone with Custom Edition can grab it and play it. Looks nice with the Open Sauce stuff, but the gameplay elements they added weren't much fun (the BR in particular felt awful, and the VISR made things look like junk). I did
a stream of the full level (gameplay starts at ~8:15, before that is stream setup and options runthrough) back when it was released if anyone is interested. Quality isn't great, since it was my first full stream with FME, but it's watchable. I've never really been able to get used to playing Halo with a mouse, which I was doing there. My muscle memory fights me every step of the way.