To play Call of Duty: Modern Warfare offline, all you need to do is select the Go Offline option. This will let you boot up the campaign and get cracking with the story, simple as you like. Even though the game box says that an internet connection is required to play, that's only for certain features
this is incorrect. Please don't post stuff like this when you have no idea.
There is no GO OFFLINE option in the PC version of the game.
Further, there is 1000's of people reporting the same issue we have.
Even further, the game detects every tool we use to make trainers and closes.
So this title is likely to never have a trainer if we cannot even run the game, and making a trainer for it is likely to be very difficult if/when we are able.
This is why there are no trainers for it out, except for paid multiplayer hacks which obviously we have no interest in making.
best,
Cal