How to Install or Reinstall Microsoft Office

A step-by-step guide to install or reinstall Office on any Windows device

What to Know

  • After purchase, sign in and enter the product key. Then, select Install Office > Run > Yes on UAC > Yes to install > Close.
  • To reinstall Office, go to My Account, select the download link, and follow the installation instructions

This article explains how to download and install Microsoft 365 or Office 2019 on a Windows or Mac laptop, computer, or tablet.

How to Install Microsoft Office

After you purchase Microsoft Office, activate and download the product. Detailed instructions are included in the packaging if you buy the software at a retail store or order a key card online from someplace like Amazon. If you order directly from Microsoft, you'll get the link in an email. There’s an "Install Office" link on the receipt.

If your organization uses volume license versions, your company's IT department might use a different method to install Office. Talk to your IT department for installation help.

  1. Visit setup.office.com and sign in with your Microsoft account or create a new account.

  2. Enter your product key (or activation code). This product key lets Microsoft know the software was purchased legally. The key comes with any physical packaging you receive and is included in an email if you ordered digitally. Select your country or region and language, as well.

    Write this activation code down and keep it in a safe place. You’ll use it if you need to reinstall Microsoft Office.

    Product Key page
  3. Select Install Office. After the installation file is downloaded, what happens next depends on which web browser you use. When you select Install, a dialog window at the bottom prompts you to either run the file, save it, or cancel. Select Run and work through the installation process.

    The easiest way to install Microsoft Office is to use the Edge browser.

    Install option for Microsoft Office.
  4. If the User Account Control asks whether you want to allow the app to make changes to your device, select Yes.

  5. Once you run the downloaded file, the installation process begins automatically. If Windows asks if you want to allow the installation, select Yes. If it prompts you to close any open programs, select Yes again.

  6. The install is finished when you see the phrase, "You're all set! Office is installed now," and an animation plays to show you where to find Office applications on your computer. Select Close.

  7. Microsoft Office is now installed and ready to use.

    You might be prompted to install updates to Office. If so, allow those updates to happen.

To reinstall Microsoft Office, go to My Account and select the download link if you don't already have the installation file on your hard drive. Then, follow the instructions outlined above. If you do have the file, run it to begin the installation process again.

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