Hi,
The "Launch Conditions" are executed when the "LaunchConditions" standard action reaches. This standard action is present on both UI and Execute sequences. So if you want to execute a custom action before Launch Conditions schedule it before the "LaunchConditions" standard action (you can schedule it under "Begin" for example).
Best Regards,
Gigi
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Gheorghe Rada
Advanced Installer Team
http://www.advancedinstaller.com