Hello Corey

I'm Diane, an Office Apps & Services MVP specializing in Outlook, and I’m happy to help you today.

You need this version -

macOS 10.13: High Sierra - 25 September 2017

https://officecdn.microsoft.com/pr/C1297A47-86C...

Hi, I'm Diane and will be happy to help you today.

For that macOS 10.13: High Sierra, you need this office version- https://officecdn.microsoft.com/pr/C1297A47-86C4-4C1F-97FA-950631F94777/MacAutoupdate/Microsoft_Office_16.43.20110804_BusinessPro_Installer.pkg

If you have any questions, don't hesitate to ask.

-- Diane

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Hi Ed Dzik,

Welcome to Microsoft Community.

You can certainly install Office on High Sierra 10.13.6. However, since the latest version of Office only supports the most recent three macOS operating systems to receive the latest security updates, and High Sierra 10.13.6 is relatively old, you can only install an older version of Office.

Office for Mac version 16.43 is the last version that supports macOS High Sierra 10.13.6. I have found the download link for you: https://officecdn.microsoft.com/pr/C1297A47-86C4-4C1F-97FA-950631F94777/MacAutoupdate/Microsoft_Office_16.43.20110804_BusinessPro_Installer.pkg

If you also wish to find download links for each version of Office for Mac, you can find them here: Update history for Office for Mac - Office release notes | Microsoft Learn

Please ensure that your account has the corresponding Office license. I hope the information and link I've shared will enable you to successfully install Office on your Mac, and I look forward to your reply!

Best Regards,

Thomas C - MSFT | Microsoft Community Support Specialist

Hello

I’m Adeyemi and I’d be happy to help you with your question.

I understand your situation. It seems that the latest versions of Microsoft Office require macOS 10.14 or later. However, you should be able to use Office apps with version 16.43 or below on High Sierra.

Here's how you can install it:

1. Visit the [Update history for Office for Mac] page. https://learn.microsoft.com/en-us/officeupdates/update-history-office-for-mac
2. Scroll to find the 16.43 version.
3. Download the package and install it.

Please note that after macOS 12.0, Microsoft supports the Office apps on macOS 10.15 Catalina or later, and if you want to continue with an older version of macOS, your Office apps will still work, but you'll no longer receive any updates including security updates

I hope this helps

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Regards Adeyemi

Dear respected PierreDesjardins,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

As per your description, it seems that you are trying to run Office 365 on Mac OS 10.13.6.

If you cannot be updated your Mac OS, then you can install and activate the build of Office2019/365 version 16.42 installation package.  You can download the full Office installer from this link: Office suite (with Teams)

You may also can download from this article Release history for Office for Mac

You should be able to activate this product using your Office 365 subscription.

Appreciate your patience and understanding and thank you for your time and cooperation.

Sincerely,

Waqas Muhammad

Hi respected E Blue,

Thanks for your valuable feedback and sharing updates with us and I really appreciate your effort and your precious time doing. 

And I appreciate your kind words.

Since, it asks you Mac version 10.13 or later in order to install the file, then, I request you to download 16.29 Office apps, here is download and install the 16.29 build of Office for Mac.

Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!

Sincerely,

Waqas Muhammad