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The solution is to manually enter the command line into the launch program button within Steam itself. In Steam, if you right click on the Rome: Total War launch button, there will be a properties option. In the general tab of properties there is a "Set launch options" button, which will bring up an empty text box. Manually type in "-mod:eb -show_err" (without apostrophe) into that box. Now when you run Rome: Total War, it will launch EB.
In other words, you must click Rome: Total War Gold and select Rome: Total War and not Barbarian Invasion--unless, of course, you are trying to make it run using BI; in which case, there is a total different set of instructions entirely, I believe.