Create a file named DONTUPDATE in any folder you want to prevent from being updated, so the Live Update will skip it. It's not recursive so, if you have a sub-folder inside that you want to exclude from updating too, you must create another DONTUPDATE file there as well.
The file doesn't have to contain anything, it can be an empty text file, the only things that matters is that is called DONTUPDATE with NO extension (no .TXT extension, for example)