Important note for Internet Explorer 11 systems This update applies only to computers that are running Internet Explorer 11 and that
do have update 2919355 (for Windows 8.1 or Windows Server 2012 R2) or update 2929437 (for Windows 7 SP1 or Windows Server 2008 R2 SP1) installed. All future security and nonsecurity updates for Internet Explorer 11 require update 2919355 or update 2929437 to be installed in order to receive updates. We recommend that you install update 2919355 or update 2929437 in order to receive continued future updates.
See Microsoft Knowledge Base article
2961851 for systems that
do not have update 2919355 (for Windows 8.1 or Windows Server 2012 R2) or update 2929437 (for Windows 7 SP1 or Windows Server 2008 R2 SP1) installed.