Just overwrite the files contained in the zip, import the product-ame.xml (choosing to overwrite) and that should be all you need to do.
All of the previous add on XML's (like the big one DJ did in the link above) should all work fine. If you have additional definitions already installed, they too should be fine though you may want to use the export option to back them all up first (older versions used to overwrite previous definitions, this one shouldnt).
HTHs
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