Update & Upgrade Problems

How to Fix Microsoft Office 16.66 for Mac Not Updating

Guest Writer Oct 9, 2026 869 views

Question details

The user is unable to update Microsoft Office version 16.66 on their MacBook Pro despite repeated update prompts.

How to Fix Microsoft Office 16.66 for Mac Not Updating

Product: Microsoft Office for Mac
Device & OS: macOS
Scenario: Attempting to install required updates or upgrades for Microsoft Office applications on a Mac.
Observed behavior: Office applications repeatedly request updates, but the installation of version 16.66 updates or required upgrades consistently fails.

Before you start

Ensure your MacBook Pro has a stable internet connection, sufficient disk space, and close all active Microsoft Office applications before attempting the update again.

Solution 1Recommended

Update Directly from Within an Office Application

Manually trigger the Microsoft AutoUpdate tool from within Word, Excel, or PowerPoint to bypass external installation glitches.

Often, background update services can get stuck in a loop. Forcing the update from inside the application ensures the Microsoft AutoUpdate utility launches correctly with the right administrative permissions.

Open a Microsoft Office application

Launch any Office app (such as Microsoft Word or Excel) on your Mac and create a new blank document.

Access the Help menu

Navigate to the top menu bar of your Mac, click on 'Help', and select 'Check for Updates'.

Configure Microsoft AutoUpdate

When the Microsoft AutoUpdate window opens, check the box for 'Automatically keep Microsoft Apps up to date' to prevent future issues.

Install available updates

Click the 'Update' button to begin downloading and installing the latest versions of your Microsoft applications.

Update Directly from Within an Office Application

Missing Update Option: If you do not see the 'Check for Updates' option in the Help menu, you may need to download the latest version of the Microsoft AutoUpdate tool directly from the official Microsoft support site.

Solution 2

Reinstall the Microsoft AutoUpdate Tool

If the built-in updater is broken or missing, reinstalling the AutoUpdate utility can resolve update loops and installation failures.

Free Microsoft Office alternative

Switch to WPS Office for Mac - Fast, Free, and Reliable

If Microsoft Office continues to experience update failures or takes up too much space on your Mac, WPS Office is the perfect alternative. It offers a familiar interface, lightweight installation, and hassle-free automatic updates.

1. Download WPS Office: Visit the official WPS website and download the free Mac version.
2. Install on your Mac: Open the downloaded package and drag WPS Office into your Applications folder.
3. Open your files: Launch WPS Office and easily open or edit your existing Microsoft Office files without formatting loss.

Fully compatible with Microsoft Office formats (.docx, .xlsx, .pptx).Lightweight installation package that won't strain your MacBook's storage.Seamless, built-in updates without complex background services.All-in-one workspace for documents, spreadsheets, and presentations.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft Office for Mac keep asking me to update but won't install?

This usually happens when the Microsoft AutoUpdate tool is outdated, blocked by security software, or experiencing a network timeout during the download process. Reinstalling the AutoUpdate tool directly from Microsoft's website often fixes this.

Can I update Microsoft Office on my Mac using the App Store?

Yes, if you originally downloaded Microsoft Office from the Mac App Store, you can update it by opening the App Store, navigating to the 'Updates' tab in the sidebar, and clicking 'Update' next to your Office apps.

What should I do if my macOS version is too old for the latest Office update?

Microsoft Office requires one of the three most recent versions of macOS to receive updates. If your Mac is older, you will need to upgrade your macOS first or switch to a highly compatible alternative like WPS Office that supports a wider range of operating systems.

Installation & Activation