This policy setting controls whether Office upgrades automatically to newer major versions. This policy applies to Office products installed via Click-to-Run. This policy has no effect on Office products installed via Windows Installer.
If you enable or do not configure this policy setting and Office automatic updates are not disabled, Office will check if a new major version upgrade is available during automatic updates. If eligible, Office will download the new major version upgrade in the background and prompt the user when it is ready for installation.
If you disable this policy setting, Office will not automatically detect or download a major version upgrade.