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The MS support article Windows Update Troubleshooting lists some of the common causes of this “ The update is not applicable to your computer” error. I use Webroot Internet Security, but since I successfully downloaded the file, I can’t see where disabling it would make any difference to the installation.
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I think I would rather continue to dismiss the warning on Firefox than start editing the registry. Searches present a variety of solutions, not all of which apply. If anyone else has run into this problem, I would appreciate their input.
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I checked for installed updates in case it was already installed, but it was not in the list. It was set to Manual start, so I set it to Automatic start, but I’m not sure if that would make any difference in a stand-alone installation. I checked my Services and saw that while the Windows Update Service was running. I double-checked that I had the correct file downloaded, and I do. I got a pop-up saying, “The update is not applicable to your computer.” I downloaded the appropriate file from the Microsoft catalog, created a backup and a system restore point, and tried to install the patch. I did a test run on my Windows 7 laptop last week with no issues, so I decided to update my desktop machine. I knew I needed KB4474419, but wanted to be sure it wouldn’t mess up a system that was already working. Firefox is my preferred browser, and I finally got tired of dismissing the message about an available update that appeared when Firefox 100 came out.
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