I'm not familiar with non-english installs... but are you sure that it's a complete duplicate? It may just be whatever files must be different, but I can't imagine it would make you download twice all the textures and such that take up so much space.
Oh, and EQ2MAP should never install inside of UI\Default since that folder is actively patched (ie anything you put in it would be trashed).
Glad to hear you got it working =)
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