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Install error

Dan Bloom 20 Reputation points
2025-12-08T17:19:42.92+00:00

Trying to add an AI based excel add-on and keep getting install error. Running Mac OS 12.7.5 What might be causing this?

Microsoft 365 and Office | Excel | For business | MacOS
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  1. Dora-T 8,520 Reputation points Microsoft External Staff Moderator
    2025-12-09T01:24:43.3833333+00:00

    Hi Dan Bloom

    Thank you for reaching out to the Microsoft Q&A forum. 

    To better understand your situation, could you please share a bit more information so I can assist you further? 

    • Which version of Excel are you currently using? 
    • Could you please share the exact name of the add-in you are trying to install?
    • Do you see any message during the installation? If possible, please share a screenshot of the message via private message so we can take a closer look. I’ll send you a private message so you can share it securely. 

    I look forward to your response. 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  1. Q&A Assist
    2025-12-08T17:19:51.54+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    There are several potential causes for installation errors when trying to add an Excel add-in on Mac OS. Here are some troubleshooting steps you can take:

    1. Check Time and Date: Ensure that the time and date on your Mac are set correctly. An incorrect time and date can cause issues when verifying the add-in's manifest.
    2. Manifest Validation: Verify that the add-in's manifest is valid. You can refer to the documentation on how to validate an Office Add-in's manifest.
    3. Reinstall the Add-in: If the add-in package was tampered with before installation, this could lead to errors. Try downloading the add-in again and reinstalling it.
    4. Office Updates: Make sure that you have the latest updates installed for your Office applications. Sometimes, installation issues can arise from outdated software.
    5. Feedback and Support: If the issue persists, consider reporting the problem through the Office feedback tool. This can help the Office extensibility team understand and address the issue.

    By following these steps, you should be able to identify and potentially resolve the installation error you are experiencing.

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