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# Application Reinstallation/Upgrade

Design your products so that they can be reinstalled easily. When a product is easy to reinstall, the process of installing upgrades and enhancements is easy, and the user can recover easily if program files are corrupted.

The reinstallation/upgrade process is similar to the new application installation process except that it does not overwrite live data files of an existing application. This prevents the loss of information that the user has created or modified.

Do not do anything that destroys the user's existing data. This is a paramount rule of installation.