How to Re-install Microsoft 365 Under Existing Paid Subscription?

If you already have an activate Microsoft 365 subscription but need to reinstall the apps on your computer—whether due to a system reset, a new device, or troubleshooting issues—the process is simple and user-friendly. Microsoft 365 links your subscription to your Microsoft account from office.com/setup, making reinstallation straightforward as long as you sign in with the same account used for your subscription.

This guide will walk you through the full process of reinstalling Microsoft 365 using office.com/setup and your existing subscription.

When Do You Need to Re-install Microsoft 365?

You may need to reinstall Microsoft 365 if:

• You purchased a new computer

• You performed a factory reset or OS reinstallation

• Office programs are not working properly

• You previously uninstalled Office to fix errors

• You want to move your subscription to another device

Before You Begin

✔ Before reinstalling:

Ensure these requirements:

• Active Microsoft 365 subscription

• Stable internet connection

• Your Microsoft account login details (used when you first activated your subscription)

✔ Optional: Uninstall the previous version

If Microsoft 365 is still partially installed or corrupted, remove it through:

• Windows: Settings → Apps → Installed Apps → Microsoft 365 → Uninstal

• Mac: Move Office apps to Trash and clear library files

• This helps avoid conflicts during reinstallation.

How to Re-install Microsoft 365 Using office.com/setup?

Follow these steps to reinstall Office on your device:

Step 1: Visit the Official Setup Page

• Go to office.com/setup in your browser.

• This page allows you to sign in and confirm your existing subscription.

Step 2: Sign in with Your Microsoft Account

1. Use the same email address that is linked to your Microsoft 365 plan.

2. This is crucial—your subscription is tied to this account, not your device.

Step 3: Navigate to "Services & Subscriptions"

• After signing in, Microsoft will display all your subscriptions.

• Look for Microsoft 365 Personal, Family, Business, or the specific plan you purchased.

Step 4: Click “Install Office”

• You will see an Install Office or Install Apps button.

• Click it, and the installer file will begin downloading.

Step 5: Run the Installer

Once downloaded:

• Windows: Open the .exe file

• Mac: Open the .pkg file

Step 6: Launch and Activate Office Apps

• Open any Office app—Word, Excel, PowerPoint—and sign in when prompted.

• This activates Microsoft 365 automatically under your existing subscription.

Managing Installations Across Devices

Your Microsoft 365 plan may allow installation on multiple devices:

• Microsoft 365 Personal: 1 user, multiple devices

• Microsoft 365 Family: Up to 6 users

• Business plans: Depending on license type

You can easily deactivate old devices from:

1. Go to office.com/setup.

2. Sign in.

3. Select Devices or Services & Subscriptions.

4. Remove unused install.

5. Reinstall on your new device.

Troubleshooting Re-installation Issues

If you face issues during installation, try the following:

• Clear old Office files- Use Microsoft’s Support and Recovery Assistant (SaRA) tool for a clean removal.

• Check your subscription status- Ensure the plan is still active under Services & Subscriptions.

• Use a different browser- Sometimes installation links fail due to browser issues.

• Disable antivirus temporarily- Overprotective antivirus software may block the installer.