If a version of Office is already installed on your computer, whether it is Office 2016/2019 or Office 365, it is recommended that you uninstall it before installing the new software.
To install Microsoft Office 2021, simply click on the "download link" next to your product key. Then wait a few minutes for the software to finish installing.
After installation, start Excel, you will normally be asked to validate your Microsoft license. Just press Next. Your Office should be activated automatically.
THIS KEY IS VALID FOR 5 PC (5 Activations)