With AV programs I always uninstall the old version first.
Edit: From Nod themselves - "If you are upgrading from version 3 to version 4, please ensure you have un-installed version 3, before installing version 4"
Not sure I'd install over the top regardless of what versions it is, some other programs yeah but definitely not an AV.
Plus we're only talking a few minutes of your life to uninstall - one way you 'know' you have no problems to the other 'maybe' having problems, it's really not worth the potential hassle to install over the top, imo.
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