The installer adds some applications to the Windows Firewall with the
acceptance of the administrator. Doing an upgrade would preserve the Firewall
settings and although I have some solutions in mind, none of them are direct.
It would help if the old version would know that is being upgraded and thus
avoid removing the Windows Firewall settings. For instance, the new installer
checks for the existance of EXISTINGPRODUCTS property that is set by
UpgradeVersion element.
<UpgradeVersion Maximum="$(var.PRODUCTVER).0" IncludeMaximum="no"
Minimum="3.1.3.0" IncludeMinimum="yes"
Property="EXISTINGPRODUCTS" MigrateFeatures="yes" OnlyDetect="no"/>
Do we have a property that tells the old version that is being upgraded?
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