*UPGRADINGPRODUCTCODE* property is set by Windows Installer when an
upgrade removes an application. An application determines whether it is
being removed by an upgrade or the Add or Remove Programs by checking
*UPGRADINGPRODUCTCODE*.
Which property is set by installer during the installation of the new
application (the one with the new version) ? How can I detect during the
the installation of the new application that this is not a new install
but in fact it is an upgrade?
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