A special third party patch has been developed which bypasses active blocking for the Kaby Lake and Ryzen PCs which are only certified for Windows 10 by Microsoft 7. There are some risks associated with this technique of overriding registry values, as described in the following:
Less than a week ago, Microsoft began actively blocking users from receiving updates on PCs running Windows 7 or 8 with a modern Intel Kaby Lake or AMD Ryzen processor. Surprise! An open-source patch is already available that lets affected users start snagging Windows updates yet again. That sure didn’t take long.
GitHub user Zeffy published a patch that supposedly defeats Microsoft’s block, as first spotted by techPowerUp. (PCWorld has not tested this patch.) What the patch boils down to is two flags: IsCPUSupported(void) and IsDeviceServiceable(void). On an unmodified system running a Kaby Lake or Ryzen processor, Windows would discover that the CPU was not supported, and therefore the device was not serviceable. But with the patch applied, Windows is told that everything’s fine and the hardware is supported.