Long-term Call of Duty players may well remember DEV Error 6036. The code has plagued previous games in the series when attempting to play in a language other than English. A short-term solution was to switch the game's language to English if you were playing a localised edition in a different language, but in the case of MW2 this may well have a very different cause.
Confusingly, DEV Error 6036 can be caused by game files or update data not being downloaded correctly, which of course was the same cause of error code DIVER above. You'll therefore want to follow the same solutions for error code DIVER as listed above- restart the game, check for server issues, check your internet connection and manually check for updates.
TRAVIS - RILEA is a connectivity error code. It will often be accompanied by a Connection Failed or Timed Out message, so now it's a matter of establishing if the problem is on your end or lies with the game.
The other option is to verify your game files and manually check for an update, as outlined above in the Error Code DIVER section. We've listed the instructions down below also for ease of use:
A: Currently, there is no solution to this issue due the demo code in IW4 being experimental and not compatible with laptop based killstreaks. To read more on this issue see the github issue report The only workaround is to not use laptop based killstreaks if you plan to playback your gameplay without issue 153554b96e