are you talking about: forcing an installation over an existing client?
I am updating from 220.127.116.110 and from my point of view all old files are removed and it is a complete new installation (especially because the directory changes from "Network Associates" to "McAfee"...
I only know this from our old 3.5.0 ePO installation...
when I checked in the package for the CMA 3.5.5 the old package (3.1.1) was deleted / overwritten
when I take a look at our actual ePO 4.0.2 installation, there is a software called "ePO Agent Key Updater" in version "3.5.5". maybe CMA 3.6 can be operated in parallel or is automatically updated, but as you can see, I can not give you a definitive answer.
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