I'm trying to play the escape from zombie island scenario, but when I load it I get an error message saying; missing entry: text\pedialcons.txt: ICON_BLDG_Bastion, then the game exits. Any Ideas

Whe you downloaded the file, you should end up with a folder with the contents(Inside the named folder Escape from Zombie Island or whatever it is, their should be an Art folder and a Text folder.) Then, you should have the Civ3ConquestsEdit scenario, with the SAME name as the folder just described above. If it still doesn't work, it is most likely the maker of the scenario forgot to type some stuff in to make the Building work.