I have a custom action which detects the version of some installed third
party library and assigns the version to some property.  Then I have a
condition reading that property to enable or disable a feature.
If I put the custom action into InstallUISequence it works very well with
the UI, but does not work in silent mode, because no InstallUISequence is
executed.
I found a few similar issues discussed on this forum and the advice was to
move the custom action to InstallExecuteSequence.  My question is: where
exactly?  If I write Before="LaunchConditions" the custom action has no
influence on the feature.

The code looks like this:




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