Installing Windows 10 update (i.e. KB4592438) may fail if the services required to run it are in an error state. In addition, corrupt temporary files or lack of space for the update can also cause the mentioned error.
Users encounter the problem when they try to update their system with the KB4592438 update, but the update fails to install (some users have encountered the error when the update installation was 100%).
Make sure all pending updates (including optional updates) are installed and then try to update the system again before proceeding with the solutions to fix the Windows update failure.