I'm going to tell you that when you try to manually install your copy of nUI, you are *NOT* installing it in the correct location.
Do this... search your entire hard drive for the file "nUI.xml" and see where it turns up. I'm going to bet you that you're going to find a copy in a place other than the one where you are trying to install it and that is going to be the location where you *should* be installing it.
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