Hello all, I'm looking for a way to prevent downgrading certain components
installed in the GAC.
What I'm currently doing is launching msiexec with UPGRADE=all
UPGRADEMODE=vomus.
This does upgrade deployed files and GAC:ed assemblies quite nicely. The
problem is that it also downgrades GAC:ed assemblies (but not deployed
files) if someone happens to use an older version of the msi.
What I have in place, is a custom action, that in my mind would detect a
newer version and display a nice little error box.
<Upgrade Id="$(var.UpgradeCode)">
<UpgradeVersion Minimum="$(var.Version)" IncludeMinimum="no"
OnlyDetect="yes" Language="1033" Property="NEWPRODUCTFOUND" />
</Upgrade>
<CustomAction Id="PreventDowngrading"
Error="!(loc.NewerVersionInstalled)" />
<InstallExecuteSequence>
<Custom Action="PreventDowngrading"
After="FindRelatedProducts">NEWPRODUCTFOUND</Custom>
</InstallExecuteSequence>
However it's not working quite the way I hoped.
Am I doing something wrong or are assemblies in GAC supposed to be
downgraded while files in program files are not? Can you spot any obvious
errors in the wix excerpts above? Is this the way downgrade preventions is
supposed to be done?
Sorry for the newbie questions. Any clues or help are appreciated. I have
tried to read the manuals and used google but my powers seem futile today.
Regards and thanks,
Cristian
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