If you have any versions of Office for Mac installed (or have done in the past) please go through the steps on this page before installing – https://support.microsoft.com/en-us/office/how-to-remove-office-license-files-on-a-mac-b032c0f6-a431-4dad-83a9-6b727c03b193
After that has been done restart your system then redeem the code below at: https://setup.office.com
** IMPORTANT** Please make sure you use the same account you used on https://setup.office.com when you are asked to login to the Office application as this is how it will activate the software for you ** IMPORTANT**