To my knowledge there is no sort of bump possession in Halo 2, but I could be wrong on that. I haven't done any real modding for it in ages, I want to get back into it though. :p
There's actually a forum post on here from the creator of said mod. He recently posted a link to the newest version in December of last year. https://www.halo2.online/threads/co-op-mode.434/page-2
I don't believe the old version works on newer versions of Project Cartographer, so be sure to...
Wait, woah, hold up! You're planning on bringing back the Live menu...? Jeeez, you guys are gonna kill me with pure nostalgia beamed straight into my eyeballs.