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Under the header "Allow applications downloaded from," select "Mac App Store and identified developers." Close the preferences window.
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Windows Users: If prompted to allow the app to make changes to your device, select "Yes." You may need to wait for the Microsoft 365 installer to download more files. Most web browsers include a download indicator at the bottom or top of the browser window for you to open the installer. After download is complete, open the Microsoft 365 setup installer.See "Uninstall Microsoft Office for Windows" and "Uninstall Office for Mac." Important: Be sure you have uninstalled any existing Office versions from your computer.Install and Set Up Microsoft 365 (Office) In the upper right, click or tap Install apps. For login details, see "Log in to Microsoft 365." To avoid computer problems, use these resource links to uninstall Office.
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Important: Uninstall First Warning: If you're installing Microsoft 365 (Office) on a computer with an existing Office version, you must uninstall Office before installing Microsoft 365. You can download and install Microsoft 365 for free on up to five computers (Windows or macOS) and up to five mobile devices. Use Microsoft 365 (Office) on your personally owned devices. Download and Install Microsoft 365 (Office) Software