Package Upgrade is the replacement of a package with its newer version to enhance functionalities or fix software defects.
Package upgrades are based on the following two scenarios:
Packages that are installed on the data drive or the RAM drive can be upgraded directly by installing a SIS file of type SA , SP or PU .
Orphan files that are not installed by an installation package can be overwritten only if the device creator has enabled the corresponding option ( AllowOrphanedOverwrite ) in the installation policy file.
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