Newer Windows PCs that are powered by Intel seventh-gen Kaby Lake processors or AMD's Bristol Ridge Ryzen chips, and running Windows 7 or Windows 8.1 are experiencing Microsoft's update block as the newer processors are not officially supported on these platforms. Microsoft has restricted updates to these older Windows versions on the said processor-powered devices, in line with its earlier announcement in January.
Windows 7 and 8.1 users with newer processors are allegedly receiving an error message stating: "your PC uses a processor that isn't supported on this version of Windows and you won't receive updates."
Nevertheless, a veteran member named 'Zeffy' on GitHub has created a patch to bypass Microsoft's block on Windows update for Windows 7 or Windows 8.1 installations. It is now ascertained that the patch will disable Microsoft's own patch that released as part of the 16 March Patch Tuesday event.
Affected users may go ahead and download the new patch via GitHub here for free of charge. That should help overcome the block on Windows updates. Alternatively, you might purchase the Windows 10 upgrade and install it to avoid any such future restrictions by Microsoft.