The second custom action must be an immediate execution custom action that informs the ProgressBar how many ticks to add to the total count during the acquisition and script generation phase of the installation. This custom action should complete your custom installation and send the amounts of individual increments to the ProgressBar control when the installer runs the installation script.
One custom action must be a deferred custom action. Note that two custom actions must be added to the Windows Installer package to accurately report time and progress information to the ProgressBar. For more information about creating an action display dialog box having a ProgressBar, see Authoring a ProgressBar Control.
Custom Actions can add time and progress information to a ProgressBar control.
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