Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
CAUTION - you can't always reinstall without OEM support if your computer came preloaded from the factory. Directions at www.office.com/myaccount stop installation and tells you (me) that you have to go through OEM support. For me, that was Toshiba and I had to pay for support plan to have them remote in to my computer and do the re-install.
WARNING - just because you fix it once, it might happen again. Thankfully the rep gave me the address & process for the re-install, because when I started my laptop today, the system went throught the dreaded Applying Patches xxxxxx process (which I thought I undid and turned off yesterday when this happened the first time). Sure enough, my Office 2013 is nuked again today and I've got to go through the whole process again today on the same computer.