Click Start > Control Panel > Programs > Programs and Features.
Click the Office program you want to repair, and then click Change.
Do one of the following:
In Office 2019, click Repair > Continue.
In-Office 2021, click Quick Repair.
You might need to restart your computer after the repair is complete.
If the issue still persists you need to uninstall the office and reinstall.
Type in the product key and click on Setup It will ask you to log in to your copyright. So that the new installation is associated with your copyright. Hence it is not required to keep the product key for future use. It will be added to your copyright.
Follow the below steps to complete the installation
However, if you’re not able to fix the Office issue after all the steps. we’d like to provide you an alternative way to install/repair Office.
If you need further assistance in performing the proposed actions, please don’t hesitate to chat with our Technical experts.