Might try manual download and install.
https://www.catalog.update.microsoft.com/Search.aspx?q=KB4592484
https://www.catalog.update.microsoft.com/Search.aspx?q=KB4592495
you'll only need one or the other, KB4592495 is security only. Also check the prerequisite SSU has been downloaded and installed.
https://www.catalog.update.microsoft.com/Search.aspx?q=KB4566425
--please don't forget to Accept as answer if the reply is helpful--
@Eric White please, please let me know which update you was able to install successfully, m looking for a work around as well. Problem is those two updates failing on my two primary domain controllers, there fore i need to fix this update. Too risky to stand up new ones.
Please, help.