

The Cumulative Updates are just for updating that specific version with the latest updates. You cannot use a Windows Cumulative Update to upgrade Windows 10 from one version to another, you have to do a version upgrade. For example, below is the Windows 10 "end of service" table from the Windows Update lifecycle fact sheet page, if you are installing the latest WindCumulative Update on a WindPro edition, it will not be applicable, since WindPro has reached "end of service", thus the update will only be applicable to WindEnterprise and Education editions, you would have to upgrade to a newer Windows 10 version that has not reached "end of service" for the edition in order to maintain the computer up to date.

To determine if the update is valid for your edition of Windows, you have to check if the current edition of Windows has reached "end of service".

If this is a Windows Update package that we provide from the Package Library, we include any pre-requisite updates that are needed inside the package. To determine if a pre-requisite update is needed, you have to look at the Microsoft KB help page, as it will list any pre-requisite that is needed. For example, if the update is for replacing a Microsoft DLL, and that DLL has already been updated\replaced by another update, such as a Cumulative Update, then the update will no longer be applicable since the DLL is already updated. To determine if the update is already installed or superseded, it's not as simple as just checking if the KB is installed, you have to look at versions of the binaries the update is supposed to replace, as those binaries may have been updated by another update.

Why is the update not applicable to the computer? This means that the Windows Update installer determined that the update you are installing is not applicable to the computer. The "Update does not apply" is a Windows Update installer error message, PDQ Deploy is just relaying the error to you. PDQ Deploy reports "Update does not apply" when deploying a Windows Update package.
