I should add that I'm using this mechanism now, and I test
"OLDERVERSIONBEINGUPGRADED", but I wanted to ask if this is the right way,
or is there a different property I can also test?

<Upgrade Id="$(var.UpgradeCode)">
  <UpgradeVersion Minimum="$(var.ProductVersion)" OnlyDetect="yes"
Property="NEWERVERSIONDETECTED" />
  <UpgradeVersion Minimum="0.0.0" Maximum="$(var.ProductVersion)"
                      IncludeMinimum="yes" IncludeMaximum="no"
                      Property="OLDERVERSIONBEINGUPGRADED" />
</Upgrade>


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