Issue

Windows Server 2008R2 fails to install KB2999226 (Internet Explorer 11) update with error 9C48. IE11 is already present on the system and seems to be functioning fine. All other updates install with no issues.

Windows system logs record Event ID 20 Error:

Installation Failure: Windows failed to install the following update with error 0x80070643: Internet Explorer 11 for Windows Server 2008 R2 for x64-based Systems.

Resolution

• Open the command prompt as administrator and run following command:
  FORFILES /P %WINDIR%\servicing\Packages /M Microsoft-Windows-InternetExplorer-*11.*.mum /c “cmd /c echo Uninstalling package @fname && start /w pkgmgr /up:@fname /quiet /norestart
  This will remove IE11 from the system which may cause some errors in certain applications and system components.
  
• Reboot the computer and install any necessary updates.
• Download and install Internet Explorer 11 offline installer
  
• Reboot the computer and install any remaining Windows updates.

The credit for this resolution goes to the following TechNet post: https://social.technet.microsoft.com/Forums/azure/en-US/dd892178-5800-43f2-a0b4-9d4e63e603ee

April 2019
Windows Server 2008R2