Hello,
I'm trying to detect when a different version of my package has
already been installed so that I can abort the installation. I'm not
looking to do the "major upgrade", I just want to abort if either an
older or a newer version is found (if the version is the same the
repair/remove logic already functions correctly). I have added this:
<Upgrade Id='$(var.UpgradeCode)'>
<UpgradeVersion OnlyDetect='yes' Minimum='$(var.ProductVersion)'
Property='NEWERVERSIONDETECTED' IncludeMinimum='no' />
<UpgradeVersion OnlyDetect='yes' Maximum='$(var.ProductVersion)'
Property='OLDERVERSIONDETECTED' IncludeMaximum='no' />
</Upgrade>
<Condition Message="Another version of this package is already
installed, you must uninstall that first.">(NOT NEWERVERSIONDETECTED)
AND (NOT OLDERVERSIONDETECTED)</Condition>
This seems to have no effect however, both older and newer versions of
the package (as defined by var.ProductVersion) are allowed to install
on top of the existing version (multiple entries then appear in
Add/Remove Programs). I also played around with different things in
the InstallExecuteSequence and InstallUISequence sections, for example
<FindRelatedProducts Before='LaunchConditions' />
But this doesn't seem to do anything either. When I log the installs
I don't see NEWERVERSIONDETECTED or OLDERVERSIONDETECTED being set to
anything.
What am I missing? Or, conversely, is there a simpler way to do what
I am trying to do?
Thanks!
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