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Next Gen: Why the Delta vs Cumulative Update is Offered for Windows 10

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Purpose

 

This article explains how our detection the Delta or Cumulative version of the patch is offered.

 

Description

 

Our detection logic will verify the  'UBR' value from the registry to determine if the Delta or the Cumulative update will be offered.

HKLM" Key="SOFTWARE\Microsoft\Windows NT\CurrentVersion" Value="UBR" (Update Build Revision)
  • The Delta is offered if build version equals N-1. (N= Latest Build. Current build being offered minus one version level)
  • The full Cumulative update is offered if build version is N-2 or less.

 

You will only be offered one or the other and never both.

There are instances where you may have the latest patch installed but you are still offered the Cumulative patch instead of the Delta. This is because you may have also installed the latest non-security update it causes only the Cumulative to be applicable.

We base our detection on what the installer will allow. We open the installer, and inspect Microsoft's logic. For the deltas, they specify that the delta only applies to exactly one UBR version, and that UBR version is the previous month's security update. You'll also notice that they only offer deltas alongside the monthly security update. They don't offer it with the non-securities.

 

 

Related Documentation

 

Windows 10 release information


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