the installer install the updater but does not run it. (you have to run the program to download the mod)
the only file that you might have, but it is highly unlikely that you do, that it will overwrite is eq2ui_mainhud_map.xml.
delete the eq2map folder it creates inside your custom folder, delete the icon_map3.dds file inside the images/icons folder, and delete the maps folder that is inside the images folder.
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