I had Office Pro 2010 installed and working fine. I had to do a repair of Windows 10 Pro. Now when I use Office 2010 it says it is an unlicensed copy. I tried adding the key via file>help>change product. It goes through the process and looks like it is taking the key. When I close it and reopen I see the same problem. Is my only option to remove and re-install the program?