Error code 1913 stops office 365 installation
Goto control panel from start button,
Select Programs and features there to reach a list of installed programs on your computer. (In windows 10 you can just type “programs and features in the Cortana search bar beside windows start logo)
From the list, search for Microsoft Office product and click on Change
A window will open like here showing Add, Repair, Remove options
Then proceed to with repair and wait for sometimes. Once the repair is successful you are ready to use Microsoft office product again.