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Office for Mac Issues

Fix Cannot Load EndNote CWYW Add-In in Word for Mac

Amos GikundaAmos Gikunda Sep 25, 2026 870 views

Question details

The user encounters an error message in Microsoft Word for Mac indicating that the EndNote CWYW add-in cannot be loaded due to incompatibility.

How to Fix the EndNote CWYW Add-In Loading Error in Word for Mac
Product
Microsoft Word for Mac
Device & OS
Mac
Scenario
Launching Microsoft Word or attempting to work on a document when an outdated or unwanted EndNote add-in attempts to load automatically.
Observed behavior
An error prompt appears stating that the 'EndNote CWYW Word 16.bundle' add-in is incompatible with the currently installed version of Word, even if the user did not intentionally install it.
Before you start

Ensure you save all active documents and completely quit Microsoft Word for Mac before attempting to check version numbers, update software, or remove add-in files.

Solution 1Recommended

Verify Version Compatibility and Update EndNote

Check if your installed versions of Word and EndNote are compatible, and update EndNote if necessary to clear the compatibility error.

The EndNote CWYW (Cite While You Write) add-in requires specific versions of Microsoft Word to function correctly. Major macOS or Office updates often render older EndNote plugins incompatible, triggering the error on launch.

1
Check Word Version

Open Microsoft Word on your Mac. Click on 'Word' in the top menu bar and select 'About Microsoft Word'. Note down the exact version number displayed in the dialog box.

2
Check EndNote Compatibility

Visit the official EndNote compatibility web page to verify which version of the CWYW add-in is required for your specific Word for Mac version.

3
Update or Reinstall

If your versions do not match, download the latest compatible EndNote installer from the official website and run it to update your CWYW add-in.

Verify Version Compatibility and Update EndNote
Version Mismatch: If you are running a recent version of Word for Mac (such as Microsoft 365 or Word 2021), you generally need EndNote 20 or newer for the CWYW bundle to load without errors.
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Frequently Asked Questions

Why is Word for Mac loading an add-in I didn't manually install?

EndNote may have been bundled with other academic software you installed, left behind by a previous user, or inadvertently transferred from an older Mac via Migration Assistant or Time Machine backups.

Where is the Mac equivalent of the Windows Control Panel to uninstall programs?

Mac OS does not have a Control Panel for uninstalling software. You typically remove apps by dragging them from the Applications folder to the Trash, or by running a specific uninstaller app provided by the software developer.

What is the Mac equivalent of the 'Windows + R' shortcut?

The closest equivalent to the Windows Run dialog on a Mac is Spotlight Search, which you can quickly open by pressing 'Command + Space'. Alternatively, you can use 'Command + Shift + G' in Finder to bring up the 'Go to Folder' search menu.