Quote:A group of administrators and users who tried to install the August or September 2018 patches on Windows 7 devices reported that the update installation would fail with error 0x8000FFFF.
The issue affected the monthly rollup updates and the security-only updates and meant that important security updates could not be installed on affected machines until the issue was resolved.
Admins and users who check the support article will notice that the error is listed as a known issue but that was not the case when the update was first released.

Quote:This update may fail to install with error 0x8000FFFF.
Before installing this update, install KB3177467, the last Servicing Stack Update for Windows 7 and Windows Server 2008 R2 SP1, to resolve this issue.

Full reading: https://www.ghacks.net/2018/09/22/windows-7-error-0x8000ffff/