Select the correct directory for this game in the launcher
I put the file directory to pluto_t6_full_game and clicked Play and it keeps showing this.
I am using Windows 11 if that is a problem.
@SinisterHappy How the heck do you have files from Black ops 2 on MW3? you have downloaded the Black ops 2 Or is the MW3. If you have the MW3 what you have to do is Verify the gamefiles / dedicated server files via steam. And if it is for black ops 2 you have to re-download and check all the files inside the folder to see if they are corrupt.
@SinisterHappy just read the install guide properly. T6 is BO2 not MW3 and obviously you can't play BO2 with MW3 files. If you read the guide carefully there is no way it doesn't work