First of all do a clean reinstall of your Rome:Total War Gold then launch it to make sure it's ok.
Install EB 1.2 into the Rome Total War folder (C-Program Files-Steam-Steamapps-Common-Rome: Total War Gold). Don't change anything in the folder.
Open Steam, go to My Games, and right click Rome:Total War Gold, select properties then open Set Launch Options. Type -mod:eb -show_err in the box. Launch EB through the desktop RTW shortcut to double check it works.
If it does install 1.2 into the same place you installed 1.1. Go to the 1.2 fixes sticky in this forum and install the permanent fixes.
That should be you good to go.
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