Office 2013 – Subscription expired but not using 365?
This appears to happen if you’ve inserted say a Office 2013 H&B product key into a fresh PC which came with Office 2013 installed. Not sure exactly whats going on, but I suspect the pre-installed Office is Office 365, not Office 2013.
The solution is as follows…
Download and run the Microsoft FixIt from https://support.office.com/en-us/article/Uninstall-Office-2013-or-Office-365-from-a-Windows-computer-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8?ui=en-US&rs=en-US&ad=US. This FixIt basically removes all flavours of Office from the machine. A reboot may be required. Then go to http://www.office.com/setup and enter the product key, login into the associated account and reinstall the Office edition you require.
NB. Got this a tech @ Microsoft.