Additionally, you may need to deactivate the previous version on the Install Status page of the Office 365 site before beginning a new install. You can find the list of previous installations by - logging into the Office 365 portal,
- clicking on your initials or image in the upper right corner,
- clicking on the View Account link,
- clicking on Manage under Office Apps link,
- and clicking Devices and viewing your registered devices. Sign Out of the device you are currently on if it is registered to an older version of office.