Whenever I try opening T5 MP I'm met with a black screen, which then minimises to show the bootstrapper. Nothing else happens past this point. As far as I know my launcher is up to date and the install of BO1 I've used is the torrent provided on the plutonium website, downloaded today (because like f*ck am I giving ATVI another £25 for a game I bought 11 years ago for a different platform).
Here's what the bootstrapper shows once the blank game window minimises: 
And here's to show that everything is setup as it should be:
There are no error boxes that show or anything like that, and Zombies/campaign works completely fine. Boots straight away.
Please help, I need a new addiction. Valorant is quickly draining my wallet lmao