Not sure where this belongs exactly, but it doesn't belong in the Consumer section.
Moved from Security Center to Business / SaaS Endpoint Protection.
If that's the wrong place can a Business moderator place it in the right section please?
SaaS Endpoint Protection 6.0.2 Patch 2 which is currently available in SecurityCenter is compatible WIndows 8.1.
Check if there is a process with a name UpdDlg.exe running in the processess list. Kill it and then run an update.