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Visit office.com/setup in your browser to start the process.
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Sign in with your Microsoft account or create a new one if you don't have one.
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Enter the 25-character product key from your Office 365 purchase.
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Select your country and preferred language for the installation.
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Download the Office setup file to your computer.
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Run the downloaded installer to start the installation.
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Sign in to your Microsoft account to activate Office after installation.
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Start using Office apps like Word, Excel, and Outlook on your computer or mobile device.