Reinstall Office 2019 on macOS Catalina Without Losing License
Question details
The user needs to reinstall Microsoft Office Home and Student 2019 on a Mac running macOS Catalina (10.15.7) but is concerned about losing their lifetime license and encountering OS compatibility errors.
- Product
- Microsoft Office Home and Student 2019
- Device & OS
- macOS Catalina 10.15.7
- Scenario
- Reinstalling Office after a system error or software update on an older macOS, while ensuring the one-time purchase license is securely preserved.
- Observed behavior
- The user needs a Catalina-compatible Office installer and confirmation that uninstalling the apps will not invalidate or consume their permanent activation license.
Ensure you know the email and password for the Microsoft account associated with your Office 2019 purchase. It is also recommended to back up your local documents to iCloud or an external drive before running the uninstaller.
Perform a Clean Reinstallation of a Catalina-Compatible Office Version
Use this method to cleanly remove outdated or incompatible Office files and license caches, then install version 16.66, which is fully compatible with macOS Catalina.
macOS Catalina (10.15) no longer supports the newest Microsoft Office updates. To get Office working again, you must remove the incompatible application files, clear out any old sign-in attempts, and manually install Office version 16.66.
Open Finder on your Mac and navigate to the Applications folder. Select Microsoft Word, Excel, PowerPoint, and Outlook, then drag them to the Trash to remove the incompatible builds.
Download and run the official Microsoft Office License Removal Tool for Mac. Follow the on-screen prompts to clear out corrupted or previous sign-in attempts and license files. Restart your Mac once the tool finishes.
Download the specific Office 16.66 installer package, which is the last fully supported release for macOS 10.15. Open the downloaded .pkg file and follow the installer instructions.
Open any installed application, such as Microsoft Word. When prompted, click 'Sign In' and enter the Microsoft account credentials associated with your Office Home and Student 2019 purchase to activate it.
Download Office Directly from Microsoft Services & Subscriptions
If you have already removed the old Office apps, you can access the installer package directly from your Microsoft account dashboard.
Try WPS Office for Mac – Lightweight, Free, and Highly Compatible
If you are struggling with complex license activations or older macOS compatibility issues, WPS Office offers a modern, fully featured alternative. It runs smoothly on older Mac systems, allowing you to handle all your daily document tasks without expensive subscriptions or frustrating version conflicts.
- 1. Download the Mac installer: Visit the official WPS Office website and download the installation package designed for macOS.
- 2. Install the application: Double-click the downloaded file and drag the WPS Office icon to your Applications folder.
- 3. Open existing Office files seamlessly: Launch WPS Office and instantly open your Word, Excel, and PowerPoint documents without dealing with activation blocks.
Frequently Asked Questions
Does reinstalling Microsoft Office 2019 use up one of my license activations?
No. A lifetime license for Office Home & Student 2019 is permanently tied to your Microsoft account. You can uninstall and reinstall the software on the same Mac as many times as you need without losing the license.
Why does Office say my operating system is unsupported on macOS Catalina?
Microsoft regularly updates Office to support only the three most recent versions of macOS. As Catalina (10.15) is older, the latest Office updates are no longer compatible. You must download a legacy version, specifically Office 16.66, to run on Catalina.
How do I clear old Office license files if my Mac won't let me sign in?
You can use the official Microsoft License Removal Tool for Mac. Running this utility clears out corrupted credentials and old cache files, allowing you to sign in fresh with your Microsoft account after you reinstall a compatible version.
Will I lose my Word documents if I uninstall Office to fix an issue?
No, uninstalling Microsoft Office applications only removes the program files. Any documents you have saved locally on your Mac, or synced to cloud services like iCloud or OneDrive, will remain completely safe and untouched.
