If you are trying to update to the Windows 10 May 2019 Feature Update (Windows 10, version 1903) or the Windows 10 October 2018 Feature Update (Windows 10, version 1809), you may encounter an update compatibility hold and receive the message, "XSlate: Your PC isn't supported yet on this version of Windows 10. No action is needed. Windows Update will offer this version of Windows 10 automatically once the issue has been resolved."
Windows 10 May 2019 Feature Update (Windows 10, version 1903):
Windows 10 October 2018 Feature Update (Windows 10, version 1809):