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Is there anyway to inform a user as to why an install has rolledback? I could pop up a messagebox in a custom action and return ActionResult.Failure but is there a more elegant way than pop up boxes as sometimes they are hidden behind the main installer dialogue and the user is sitting there for ages before noticing.
Not really. You can only show a message box from your custom action in case it fails.
Windows Installer doesn’t support action return value handling. So if something fails, there’s not much you can do to inform the user. The standard dialogs and messages will be used.