Hi all,
What would be the correct way to check if another software (same publisher) is already installed and then refuse to proceed with the installation?
Rationale: The product about to be installed would irreversibly alter existing installations of several predecessor products, so the installer must make sure no such conflict existis before installing. A warning message is supposed to appear, warning the user to uninstall said products first, or at least make a system backup.
As far as I understand, a Launch Condition can accomplish this?
I find the dialog for adding launch conditions a bit confusing.
How would an expression for this look like?