Activation Problems

How to Fix Office 2019 Activation Problems on M1 Mac

Olivia Miller Oct 9, 2026 869 views

Question details

The user is experiencing a recurring activation prompt for Office 2019 Home & Business on an M1 Mac after reinstalling the software, despite having a valid, previously redeemed license.

Fix Office 2019 Activation Problems on an M1 Mac

Product: Microsoft Office 2019 Home & Business
Device & OS: Mac (M1)
Scenario: Reinstalling Office 2019 and attempting to activate the perpetual license on an Apple Silicon Mac.
Observed behavior: The application continuously prompts for activation, failing to recognize the perpetual license due to an auto-updated version mismatch.

Before you start

Ensure you have your Microsoft account credentials ready and confirm that your Office 2019 Home & Business license is actively linked to your account before uninstalling any apps.

Solution 1Recommended

Install Office Version 16.78.3 and Disable AutoUpdate

Downgrade to the final compatible release for Office 2019 (version 16.78.3) to resolve license mismatch issues caused by automatic background updates.

This activation loop is usually caused when Microsoft AutoUpdate installs a newer version of Office (like Office 365 or Office 2021 builds) that does not recognize your perpetual Office 2019 license. Because Office 2019 has reached the end of its update cycle, version 16.78.3 is the final supported release for your license.

Uninstall the current Office version

Open the Applications folder on your Mac, locate all Microsoft Office applications (Word, Excel, PowerPoint, Outlook), and drag them to the Trash.

Download the compatible 16.78.3 version

Navigate to the official Microsoft release history page for Office for Mac in your browser, locate the download link for version 16.78.3, and download the installer package.

Install the downloaded package

Double-click the downloaded .pkg file and follow the on-screen instructions to install the compatible version of Office 2019 on your M1 Mac.

Disable Microsoft AutoUpdate

Open Microsoft Word, click on the 'Help' menu at the top of the screen, select 'Check for Updates', and uncheck the box that says 'Automatically keep Microsoft Apps up to date'.

Install Office Version 16.78.3 and Disable AutoUpdate

Activation Preserved: By locking the software to version 16.78.3, your Office 2019 license will remain activated without continuously prompting you for a Microsoft 365 subscription.

Free Microsoft Office alternative

Switch to WPS Office for a Hassle-Free Experience on Mac

If you are tired of activation loops, subscription prompts, and version conflicts on your Mac, WPS Office provides a lightweight, free, and highly compatible alternative to Microsoft Office.

1. Download the Mac Installer: Visit the official WPS Office website and click the download button for Mac.
2. Install WPS Office: Open the downloaded .dmg file and drag the WPS Office icon into your Applications folder.
3. Open Your Files Seamlessly: Launch WPS Office and instantly open your existing Office files without worrying about compatibility or activation.

Fully compatible with Microsoft Office formats including DOCX, XLSX, and PPTX.No confusing activation loops or forced subscription upgrades.Native support and highly optimized performance for Apple Silicon (M1/M2) Macs.All-in-one tabbed interface for managing documents, spreadsheets, and presentations.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Office 2019 keep asking for activation on my Mac?

This happens when Microsoft AutoUpdate automatically installs a newer build of Office that requires a Microsoft 365 subscription, thereby overriding your valid perpetual Office 2019 license.

Is version 16.78.3 the last update for Office 2019 on Mac?

Yes, version 16.78.3 is the final official update that supports the Office 2019 perpetual license. Any newer versions will require a Microsoft 365 subscription or an Office 2021 license.

How do I stop Microsoft AutoUpdate from running on my Mac?

You can disable it by opening any Office application, navigating to the Help menu at the top, selecting 'Check for Updates', and turning off the automatic update toggle.

Installation & Activation