Directly from the page/section you linked, the first 3 steps explain it pretty clearly:
Quote:
These steps were used on August 18, 2011:
1. Locate the Underfoot install. Mine resides in C:\EQ\Everquest_UF\.
2. Make a new folder for the Live install, C:\EQ\Everquest_Live\ is a good location.
3. Copy everything from the Underfoot folder to the Live folder.
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It means that you make a copy of your UF folder so you can download the Live files to the new copied folder. You never patch your UF folder, only copy the needed files to it. I added an extra note in bold about not patching, just in case.