If you are playing the Brutii then you are not playing EB. EB only has one Roman faction.

The most likely thing is that you've installed EB in the wrong location. You'll need to uninstall it and reinstall making special care that you install it into the folder that contains the file RomeTW.exe. You should also install the Trivial Script that comes with the EB1.1 installation. This will install shortcuts that you will use to start the game (you don't use the RTW shortcuts).

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