If you tried to install a 64-bit or 32-bit version of the Microsoft 365 or Office, or a standalone application such as Visio on a computer that already has either the 32-bit or 64-bit version of Microsoft 365 or Office, you could see an error message similar to the one below. This occurs because you can't mix 64-bit and 32-bit versions of Microsoft 365 or Office.
What to do
To fix this error and switch from 32-bit to 64-bit (or vice-versa), you must do the following in this order.
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Uninstall Microsoft 365 or Office
Go to Uninstall Office from a PC and follow the steps to uninstall the version of Microsoft 365 or Office (or stand-alone Microsoft 365 or Office application, such as Visio or Project) you don't want.
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Install the 32-bit or 64-bit version of Microsoft 365 or Office
Select your version below and follow the installation steps.
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Microsoft 365, Office 2024, or Office 2021 (Follow the steps to select a specific bit version, such as 64-bit if that's the version you need.)
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Office 2019, Office 2016, or Office 2013 (Follow the steps to select a specific bit version, such as 64-bit if that's the version you need.)
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For overall guidance about which version to install, see Choose the 32-bit or 64-bit version of Office. If you're not sure which bit version you may have already installed, see What version of Office am I using?
