Numerous users have reported that they are unable to install the latest KB4512508 Cumulative Update for Windows 10 1903 as they fail on install with a variety of error codes such as 0x800f0982 and 0x800f081f. […]

from https://www.bleepingcomputer.com/news/microsoft/windows-10-1903-users-report-errors-installing-kb4512508-update/