Sorry to bump an old thread but if you get that update message and you know you have all the official patches and your master server patch is version 1.5.2 then uninstall it and re-install it making sure to untick the update feature when it gives you the option. I had the same issue and this solved it for me, hope it helps.
ok, i got the 1096 update and now it says it needs to update to play online but everytime i press update it says I/O errror 123! Help! I want 2 play multiplayer!
I got the master server patch but when i try to join a game it says:game resources differ from server. And when i try to host a game it says:Coudn't load selected map or something. Do i need to install something?