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Rollback Installation

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When the Windows Installer processes the installation script for the installation of a product or application, it simultaneously generates a rollback script and saves a copy of every file deleted during the installation. These files are kept in a hidden system directory and are automatically deleted once the installation is successfully completed. If however the installation is unsuccessful, the installer automatically performs a rollback installation that returns the system to its original state.

Automatic rollback of an unsuccessful installation is the default behavior of the installer. To disable rollback during an installation use one of the following:

Whenever rollback is disabled, the installer sets the RollbackDisabled property.

If an installation uses custom actions, additional authoring of the installation package is required to use rollback functionality. For more information, see Rollback Custom Actions.