Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Or use RevoUninstaller to uninstall it. It reaches into the registry, deeply, to find keys that, otherwise, would remain. Then go to "Program Files" and delete every "Office" folder you see. Then, in "Search", or "Run", type %temp%>Hit "Enter"> choose "Select All"> Delete> Continue/Yes>Continue (if asked again in a "Permissions" dialogue box), then "Skip"; empty "Recycle Bin"; Restart, then try install again after doing the "Taskmgr"/Task Scheduler" process described above. And the most confident I can be is "it might" install without a hitch. After my Windows 10 debacle, I am 100% confident in nothing from Microsoft...