To install Office 365 you've already purchased, go to office.com/setup, sign in with your Microsoft account, enter the product key, download the installer, and follow the prompts to complete the installation.
How to Install Office 365 Already Purchased
To install Office 365 that you've already purchased:
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Go to office.com/setup.
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Sign in with the Microsoft account linked to your purchase.
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Enter your 25-character product key (if prompted).
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Download the installer and run it.
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Follow the on-screen instructions to complete the installation.
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