How to Download and Install or Reinstall Office 365 on a PC via Office.com/setup?

Setting up Microsoft Office 365 for the first time or reinstalling it after switching devices, the process is simple and user-friendly. Microsoft provides an easy installation flow through Office.com/setup, where you can redeem your product key, sign in to your Microsoft account, and download the software directly to your PC. Whether you have a subscription version like Microsoft 365 or a one-time purchase such as Office Home & Student, the setup experience is streamlined and efficient.

What is Office.com/setup?

Office.com/setup is the official portal where users activate, download, and install Microsoft Office on their devices. It allows you to enter your 25-digit product key, link it to your Microsoft account, and follow guided steps to complete the installation.

Steps to Download and Install Office 365 on a PC

Follow the step-by-step guide below to download and install or reinstall Office 365 on Windows:

Step 1: Visit Office.com/setup

• Open your browser and go to Office.com/setup.

• Here, you’ll need to enter your 25-digit product key provided with your purchase. 

• This typically looks like: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

Step 2: Sign In to Your Microsoft Account

• After entering the product key, sign in using your existing Microsoft account, or create a new one if needed. This account will be tied to your Office license, so you can reinstall Office later if necessary without another purchase.

Step 3: Download Office 365

• Once logged in and your key is redeemed, click on the Install Office button. The installer file will begin downloading automatically.

Step 4: Run the Installer

• Locate the downloaded setup file (usually named Setup.exe) and double-click it.

• A prompt may appear asking permission — select Yes to allow installation.

Step 5: Complete the Installation

• The installation begins automatically, and you’ll see a progress window.

• Once done, a message will confirm: "You're all set! Office is installed."

Step 6: Activate Office

• Open any Office app like Word or Excel.

• Sign in with your Microsoft account to activate Office.

• After activation, Office will sync your subscription and features.

How to Reinstall Office 365 Using Office.com/setup?

If you are reinstalling Office due to system reset, device change, or uninstallation:

1. Go to Office.com/setup or Office.com/myaccount.

2. Sign in using the same Microsoft account used during original setup.

3. Select Install Office.

4. Download and run the installer.

5. Activate Office after installation.

6. No need to re-enter your product key—the license is already linked to your account.

Tips Before Installing Office

• Ensure your PC meets the minimum system requirements.

• Remove old or trial versions of Office to avoid conflicts.

• Keep a stable internet connection during installation.