Attempting to use a trainer online via C&C:Online or LAN will trigger an immediate "Game Asynchrony" error. The game engine stops the match because data mismatch occurs between players.
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For modders and trainer users, v1.4 is critical because: Attempting to use a trainer online via C&C:Online
Are you running any , or playing the vanilla game? Share public link Command And Conquer Generals Zero Hour Trainer V1.4