Computer Configuration > Policies > Centrify Settings > Mac OS X Settings > Software Update Settings > Automatically check for software updates (Legacy, Currently supported)
Note: There are actually separate versions of this policy in version-specific folders.
Periodically check for updated versions of the software installed on the local computer and automatically download and install newer versions. You can configure the version-specific versions of this policy the same way you can configure the Software Update system preference for the corresponding operating system version.
This policy takes effect when users log out and log back in.