Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello @Lisa Owen
If you purchased Office Professional 2019 as a one-time purchase, you don't have to use Microsoft 365. You can reinstall and activate Office 2019 using the license associated with your purchase.
First, open Word and go to File > Account. Under Product Information, check whether it currently says Microsoft 365 or Office Professional 2019.
If Microsoft 365 is currently installed and you specifically want Office 2019, first make sure your Office 2019 license is available before uninstalling anything.
If you previously redeemed Office 2019 and associated it with a Microsoft account, sign in with that same account and look for your Office 2019 product under your account's products/services. Once you redeem an Office 2019 product key and associate it with an account, you normally reinstall it using that account rather than entering the key again.
If Office Professional 2019 appears there, you can uninstall the Microsoft 365 version from Settings > Apps > Installed apps, restart the computer, and then install Office 2019 using Microsoft's installer associated with your license.
One important exception: if yours is Office Professional Plus 2019 rather than Office Professional 2019, the installation method may differ because Professional Plus is commonly a volume-license product. Microsoft specifically notes that Professional Plus, Standard, Workplace Discount Program, and volume-license editions can have different installation procedures.
Also, Office 2019 reached end of support on October 14, 2025. It can still work, but Microsoft no longer provides regular security fixes, bug fixes, or technical support.
Before uninstalling Microsoft 365, could you tell us exactly what your purchased license says: Office Professional 2019 or Office Professional Plus 2019, and whether Office 2019 appears in your Microsoft account? That will determine the correct installation method without risking your existing installation.
References:
Download/install or reinstall Office 2019
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