Office 365 without any update or upgrade, pay monthly or yearly customer, no one interest to use it. Can’t update or upgrade , better install stand alone Office 2016 instead.
Office 365 by default is automatic update and upgrade. That is the reason whey you install Office 365 will become Office 2016 or Office 2019 (windows 10). After complete install, It shown up Office 2016 because Office 365 is in the market for very long time. The retail version of Office 365 will also upgrade to Office 2016 and Office 2019 according your Windows version. If you can use Office 365 batch file activated the Office 2016, that is Office 365 base Office 2016 can have future feature update. But if you Office 2016 batch file to activated, It will become Office 2016, won’t get any new feature update anymore.
1, Control panel, Programs and feature, Uninstall all office program.
2, Google: Office fix tool
uninstall all MS Office program left behind from your PC, restart PC and try again.