How to Fix Modern Warfare 2 Join failed because you are on a different version

The 'Join failed because you are on a different version' error occurs when a player is trying to join a game and the game server is running a different version than the one the player is running. This can happen for various reasons, such as the game server being updated or a player running an old version of the game.

If you are facing this issue, there are a few steps that you can take to try and resolve the issue.

The first thing you should do is check to make sure that you are running the most recent version of Modern Warfare 2. To do this, you can open the game and look for a button to check for updates. If there is an update available, make sure to download it and restart the game to see if the issue is resolved.

If you have already checked for updates and there are none, the next step is to restart Modern Warfare 2. This can be done by closing and re-opening the game. If this does not resolve the issue, you should try restarting your computer as well.

Another fix that you can try is to switch to Google DNS. This involves changing your DNS server settings to use Google's DNS server. To do this, you can go to your Network Settings and then select the Advanced tab. Here, you can change the IP address to 8.8.8.8, which is Google's DNS server.