Install Microsoft 365 64-bit version

Last Updated on May 14, 2020 by Next Century

Office 365 is installed as a 32-bit program on your Windows PC by default.

Microsoft recommends the 32-bit version, even on 64-bit systems, to avoid compatibility issues with third-party add-ons. However, there may be instances when you’d want the 64-bit version, like if you’re using a very large database or worksheet.

If you need the 64-bit version of Office, follow these steps:

  • Go to and log in using your Microsoft account

  • Click on the Install Office

    NOTE: This example above is for a Microsoft Office 365 Home subscription

  • Click on Other options

  • Click on Choose a version dialog box and select Office – 64-bit

  • Then click on Install

    NOTE:  If you want to download the full installation file so that it can be installed quickly on other computers, tick Download an offline installer

  • Once you have downloaded the 64-bit install file, run the downloaded file to setup and complete the installation

Remember that you can’t have both the 32-bit and 64-bit versions of Office installed at the same time. If you already have the 32-bit version installed, you’ll need to uninstall it before installing the 64-bit version. For more details on the differences between the two versions, refer to Microsoft’s documentation.

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