Have you tried repairing Office? You can do this by going to the control panel, uninstall a program, click Microsoft Office XXX and clicking change at the top. I would suggest you do an "Online repair" after reboot and try to update.
If you still get the same error try to remove Office with all its updates O15CTRRemove.diagcab. You can get it from this link https://support.office.com/en-us/article/Uninstall-Office-2013-Office-2016-or-Office-365-from-a-Windows-computer-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8
Let me know if this works!
Method 1: Reinstall Office updates
- Click the
Windows Explorerin the search box.
- Click the
Windows Explorerfrom the pop-up
- Navigate to
C:\Users\All Users\Microsoft\Office\datapath, find
opa12.datfile and rename it to
- When you restart Windows Office and open one file, it will prompt you to activate Windows Office, then activate it online.
- Reinstall Windows Office updates and restart computer.
Method 2: Reset Windows Update components
If the issue is with the Windows update components, this method will resolve the issue by repairing all the components associated with it. Click on the link below and follow the article on the same.