I don't think you installed EUI correctly - make sure it is in the DLC folder of your Civ 5 base install.
G
I used the full install, and pointed to Sid Meier's Civilization V\Assets\DLC , cleared the cache , and even uninstalled possible conflicts mods following the compatibility thread http://forums.civfanatics.com/showpost.php?p=13662147&postcount=3