Currently, when you are installing updates manually on a Windows 10 system or are using update management solutions such as WSUS or Configuration Manager, you may run into update installation issues if an update depends on a particular Servicing Stack update that is not installed. Windows will quit the installation of the update with the error "update isn't applicable" and it is up to the system administrator to figure out why it cannot be installed on the device.
Starting in September 2020, and only for Windows 10 version 2004 and Servicing Stack update September 2020, or later, this behavior is a thing of the past. Cumulative updates for Windows 10 will include the Servicing Stack update that the cumulative update requires so that the error should not be thrown anymore.
Our goal is for all IT administrators, whether managing devices on-premises or from the cloud, to experience the simplicity of having a single cumulative monthly update to deploy that includes the month’s cumulative fixes and the appropriate servicing stack updates for that month, if applicable.
Separate Servicing Stack updates will no longer be offered for operating system versions that support the new bundled cumulative update packages.
Microsoft will apply the change to updates on Windows Server Update Services (WSUS) and the company's Microsoft Update Catalog website.
Microsoft believes that the new process will make life easier for administrators, as it is no longer required to pay attention to Servicing Stack update requirements. Administrators don't need to search for Servicing Stack updates and cumulative updates Knowledgebase articles anymore, as all information "will be in a single KB article". It is no longer necessary to check if a cumulative update has a specific Servicing Stack update dependency.
Microsoft has no plans to backport the system to previous versions of Windows 10. Administrators who administrate devices running older versions of the Windows operating system need to research dependencies just like before as nothing changes in that regard.
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