KB4561645 not installing on some Windows Server 2008 PCs

Microsoft uses Patch Tuesday to release feature improvements and fixes for security issues affecting Windows PCs. Today, the company shipped multiple updates, including KB4561645, a security-only patch for Windows Server 2008.

However, some users are getting an error when they try installing the latest fix on their PCs. Fortunately, Microsoft has revealed the reason why.

KB4561645 not installing on some Windows Server 2008 PCs

As you may remember, Windows Server 2008 already reached its end of support. That means Microsoft no longer delivers free feature improvements or security updates for devices running on the operating system.

However, premium extended support for the OS is still available. Therefore, according to Microsoft, only ESU-supported devices can successfully install KB4561645.

In other words, you have to be running an OS edition that’s eligible for ESU. If you try installing on a non-supported PC, you’ll get an error after restarting your machine.

After installing this update and restarting your device, you might receive the error, “Failure to configure Windows updates. Reverting Changes. Do not turn off your computer”, and the update might show as Failed in Update History.

If you’re encountering that issue, confirm that you’re running a supported OS. If you are, make sure your add-on key is installed and working on your PC.

The above issues may not be the only thing preventing you from securing your machine with KB4561645, though.

Therefore, verify that you installed the necessary updates for Windows Server 2008 ESUs to install smoothly without any issues.

For example, do you have servicing stack update KB4493730 installed? Microsoft shipped the SSU back in 2019.

Similarly, be sure you have the ESU Licensing Preparation Package or KB4538484, which rolled out on February 11, 2020.

Windows 7 users without ESU support are also unable to install the latest security update available for the OS this Patch Tuesday.

Have you migrated from Windows Server 2008 yet? Feel free to let us know or ask any questions via the comments section below.

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