Installation Guide for Office Standard - MacOS

If you have Office 365 installed on your machine, you need to uninstall it completely by following the
Microsoft 365 Deinstallation.

Office Installation

1. Download the two files — Office Standard (installer) and Product Key (serializer) — from the links provided in your email or invoice.
2. Check your macOS version before installation:
   • For macOS 10.14 (Mojave) through macOS 12 (Monterey), use Office 2021 version 16.53 (Intel or early Apple Silicon via Rosetta).
   • For macOS 11 (Big Sur) through macOS 14 (Sonoma), use Office 2021 version 16.77 (Intel and Apple Silicon, Universal Binary).
3. Double-click the installer and follow the on-screen prompts until it finishes.
4. Run the serializer file to activate your license once installation is complete.
5. Open Word, Excel, PowerPoint, or Outlook from the Applications folder. Office will automatically check for updates — allow it to finish.

Hint: If a message appears saying you must update macOS for newer Office updates, you can safely close it — your current version is already up to date.

5. When prompted to sign in, select "Skip sign in" to continue without a Microsoft account.

Hint: Each Office app may ask you to sign in again — just skip it each time.

6. After confirming all apps open and save files normally, you may sign in later if you prefer — it’s optional.

Microsoft 365 Deinstallation

1. In the Applications folder, select and move Word, Excel, PowerPoint, Outlook, and OneNote to the Trash.
2. Use Spotlight search (the magnifying glass icon at the top right) and type: Microsoftregistrationdb
   
   
3. Click on the Microsoftregistrationdb folder to open it.
4. Select Column View to display the folder containing MicrosoftRegistrationDB.
5. Select and move the following three folders starting with “UBF8T346G9” to the Trash:
   • UBF8T346G9.com.microsoft.oneauth
   • UBF8T346G9.ms
   • UBF8T346G9.Office
     
6. Empty the Trash.
7. Office 365 is now completely removed. Reinstall Office by following the Office Installation steps above.

Installation Error

If you encounter an error and Office does not activate:

1. Confirm that the version of Office you are installing matches your macOS version:
   • Use the 16.53 installer for macOS Mojave through Monterey.
   • Use the 16.77 installer for macOS Big Sur through Sonoma.
2. If Office asks you to log in to a Microsoft account, this means Office 365 was not completely uninstalled. Follow the Microsoft 365 Deinstallation procedure again.
3. After removing all Office 365 components, reinstall the correct Office version followed by the Serializer.
4. Open any Office app and wait for automatic updates to complete.
5. When prompted to sign in, choose "Skip sign in".
6. Each program (Word, Excel, PowerPoint, Outlook) may request sign-in again — skip it each time.
7. After confirming all applications work properly, you may sign in later if desired.

If you still experience installation or activation issues, please contact us through our
contact form and include a screenshot of the error message. We are happy to assist you.

Your Keys.Express Team