Hi,
I would like to check if this registry key "UpdateToVersion" is present on the system, if yes try taking a backup of the same and delete it.
Note: please make a backup of the registry prior to deleting the registry key. For more information on how to back-up the registry please follow the article.
How to back up and restore the registry in Windows
To open the registry editor, Press Windows Key + R on your keyboard to open up the run window, type in regedit, and hit enter. Once opened browse to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration
Once done, try updating office by going to FILE>ACCOUNT>Office Updates.
Do get back to us if you need further assistance with Office applications.
Thank you.