Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi (A73), do you mean you are re-installing your Office Suite?
If so:
Use this tool from Microsoft to remove all remnants of a previous Office Installation:
https://support.office.com/en-us/article/Uninst...
Then go to http://www.office.com and if you're not already signed in, select Sign in
On the Office home page, select Install Office - Install