Hi Ahing,
Thank you for posting here.
According to the introductory article in KB3114374, this update can only be obtained in two ways:
- Use Microsoft Update to automatically download and install the update.
- Manual download and installation from the Microsoft Download Center.
So this update cannot be found through WSUS or Microsoft Update Catalog.
For reference, please browse this article: "December 8, 2015, update for Excel 2016 (KB3114374)."
Hope the above can help you.
Regards,
Yic
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