Here you go a working code snippet, works fine for wix 2.0.3116.0 (yep,
i know it's obsolete):
<Upgrade Id="$(var.ProductUpgradeCode)">
<UpgradeVersion Minimum="$(var.ProductVersion)"
OnlyDetect="yes" Property="NEWERVERSIONDETECTED" />
<UpgradeVersion Minimum="0.0.0" Maximum="$(var.ProductVersion)"
Property="PREVIOUSVERSIONSINSTALLED" IncludeMinimum="yes"
MigrateFeatures="yes" />
</Upgrade>
...
<InstallExecuteSequence>
<Custom Action="ERRCA_NewerVersionFound"
After="AppSearch"><![CDATA[NEWERVERSIONDETECTED]]></Custom>
<RemoveExistingProducts
After="InstallValidate"><![CDATA[PREVIOUSVERSIONSINSTALLED]]></RemoveExistingProducts>
</InstallExecuteSequence>
Also, please read documentation carefully about where to place
RemoveExistingProducts action into InstallExecuteSequence table.
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