When your admin has specified you authorization to install updates, the Microsoft AutoUpdate will make sure your duplicate of Office will almost always be up-to-day with the most recent security fixes and enhancements. To install or look for updates in your Mac, see Check for Office for Mac updates instantly. https://installmicrosoftoffice08630.onesmablog.com/everything-about-microsoft-office-2021-premium-license-for-3-devices-66829048