Your processor is no longer new. A week ago, Microsoft announced blocking access to Windows 7 and Windows 8.1 updates for computers with the latest Intel and AMD CPUs – Kaby Lake or Ryzen. Introduced with the latest updates, the lock has already been broken.
Microsoft’s move has caused Windows Update on Windows 7, 8, and 8.1 to not receive important security updates if there is a new, unsupported processor on the computer. A person under the nickname Zeffa has thoroughly reviewed the March update package for these operating systems and has discovered new “IsCPUSupported (void)” and “IsDeviceServiceable (void)” components in the dynamically linked library “wuaueng.dll”.
An open source code patch is available on the network that simply exploits Windows Update to ensure that your computer complies with the latest Microsoft processor guidelines. You can find it at github.com/zeffy/kb4012218-19/releases. It’s worth bearing in mind that its availability is unlikely to please Microsoft, which may choose to include changes that block its operation in future updates.