NOTE: Some times when Microsoft release a new OS they might rename the GPO setting but still keep the underlying Registry Key the same.
Supplemental information has the following sections: For administrators who are not already familiar with Group Policy, the first section provides an overview about the general use of Group Policy.
The Group Policy tools —Group Policy Object Editor and Group Policy Management Console—remain largely unchanged.
In the majority of situations, you will not notice the presence of ADMX files during your day-to-day Group Policy administration tasks.
Alternatively, you could just leave the policy setting configured and do the ADMX upgrade and just live with the “Extra Registry Settings” message in GPMC (See below).
Note: This policy will still apply with the “Extra Registry Settings” will still apply to the Windows 10 1511 build.