Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
It's unclear if this is an Apple issue or a Microsoft issue
Microsoft Office installer recognizes OS X 10.8.5 (12F37) but not the last Supplemental Update version code 12F45, so, when someone try to install Office 14.3.8 update, the installer says that the software requires OS X 10.5.8 or later.
Cross-check: if you have a Mac updated to 10.8.5 Supp.Upd. and you uninstall Office 2011, you'll not be able to install it again