HELP ME.. lol?

i have all the time this error when i try to connect server Couldnt load an official pak file; verify your istallation and make sure that is has been uptated to the latest version.
and i have isntalled latest version (all of them in this order 1.02 2.60 2.60b) and im gonna kill my self if im not able to play ET soon! so help me pls...