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Download and install or reinstall Microsoft 365 on a Windows PC

A step-by-step guide to download and install or reinstall Microsoft 365 or Office on any Windows device

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Download and Install Office

This article explains how to download, install or reinstall Microsoft 365, Office 2021, Office 2019, and Office 2016 on your PC and Mac.

Tip: If this is a new purchase and you’re installing Office for the first time, type in your browser, sign in with an MS account, or click create a new account. Enter your product key, and follow the on-screen steps to complete the Office setup and download.

Step 1 – Sign In to Download Office

Open your browser and visit

1. Open your browser, visit, and click Sign In if you’re not already signed in.

Click Sign In.

2. Sign in with the account associated with this version of Office.

On the Office home page, click Install Office.

3. On the Office home page, click Install Office.

Select Install.

4. Select Install.

Office setup file is downloading.

5. Your Office will start to download on your computer. To finish the installation, follow the steps in the Install Office section below.

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Step 2 – Install Office

Click and open the downloaded setup file.

1. Click and open the downloaded Office setup file to install Office.

Click Run or Save File.

2. Depending on your browser, choose Setup (in Chrome), Run (in Internet Explorer), or Save File (in Microsoft Edge or Firefox).

Click Yes on User Account Control prompt.
  • If you see the User Account Control prompt, click Yes.
The installation begins.

3. The installation begins.

Click Close when you see the phrase, "You're all set! Office is installed now."

4. When you see the phrase, “You’re all set! Office is installed now,” an animation shows you where to find Office applications on your computer. Click Close.

To find your Office applications, click Start > All Apps.
  • Follow the instructions in the window and to find your Office applications, click Start > All Apps.

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Step 3 – Activate Office

Click the Start icon and type the name of an Office app, like Word.

1. To open an Office app, click the Start icon (in the lower-left corner of your screen) and type the name of an Office app, like Excel or Word.

To open the Office app, click its icon.

2. To open the Office app, click its icon from the search results.

Select Accept to agree to the Microsoft Office License terms.

3. In most cases, Office is activated when you open an application and select Accept to agree to the Microsoft Office License terms.

If the Office activation wizard appears, click sign in to activate Office.
  • Your Office may activate automatically. However, the Office Activation Wizard may appear depending on your product. If so, click the Sign In button and follow the on-screen instructions to activate Office.

RELATED: How to Activate Microsoft Office on PC or Mac


To Reinstall Microsoft Office:

  1. If you don’t already have the installation file on your computer, visit the My Account page and click the download link to reinstall Microsoft Office.
  2. Follow the steps outlined above.
  3. If you have the Office Setup file, run it to start the installation process.

RELATED: 2 Ways to Reinstall Microsoft Office


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