Meltdown and Spectre - Patch Installation Failure - Unknown Error Code : 15613

Note: We recommend you install the latest updates to avail all latest fixes.


You are getting the error message "Unknown Error. Code - 15613", when you try to install the following Windows updates to your endpoints.

  • KB4056888
  • KB4056890
  • KB4056891
  • KB4056892
  • KB4056894
  • KB4056895
  • KB4056896
  • KB4056897
  • KB4056898
  • KB4056899


Because of an issue that affects some versions of antivirus software, the above updates cannot be applied to computers on which antivirus is installed and the following registry key is not set.



Microsoft resolved this issue in the latest monthly security and quality updates. So we recommend you to deploy the latest updates.

How to find and deploy the latest monthly security and quality updates?

  • For Windows 7, Windows 8.1, Windows Server 2008 R2, Windows Server 2012

  • For Windows 10 and Windows Server 2016

Applies to: Meltdown updates, Spectre updates, Meltdown and Spectre security updates, Microsoft security updates, antivirus compatibility issue

Keywords: Meltdown and Spectre updates, Meltdown updates, Spectre updates, Antivirus compatibility issue, Microsoft security updates