MICROSOFT OFFICE 365 UPGRADE

You normally do not need to download Office again or restart the PC after upgrading from Microsoft 365 Personal to Premium; refresh the license in an installed Office app.

Update the existing installation

1. Open Word, Excel, or PowerPoint.
2. Select File → Account.
3. Under Product Information, select Update License.
4. Sign in with the Microsoft account used to purchase the Premium subscription.
5. If prompted, close and reopen all Microsoft 365 apps.

The license usually refreshes automatically, but a new purchase or entitlement can take up to 72 hours to appear; Update License requests it immediately. You can verify the result under File → Account → Product Information.^1^

If you received a product key

If Premium was purchased from a retail or online store and you received a product key, it must first be redeemed:

1. Go to https://office.com/setup.
2. Sign in with the Microsoft account you want linked to Premium.
3. Enter the product key and complete the prompts.
4. Return to an Office app and select File → Account → Update License.

Redeeming the key is a one-time process that adds the subscription to the Microsoft account.^2^

Reinstall only if the upgrade does not appear

First check https://account.microsoft.com/services and confirm that Premium is listed as active under the same Microsoft account used in Office.

If it is active but Update License still leaves Office on the previous subscription:

1. Sign out of the Office app.
2. Close every Office app.
3. Reopen one app and sign in with the account holding Premium.
4. Reinstall only if the license still does not update.

For a reinstall, uninstall Microsoft 365 using Control Panel → Programs → Programs and Features, restart Windows, and then install it from the Services & subscriptions page. Microsoft’s uninstall troubleshooter is also available for Windows 10 or later.^3^

References

1. Update License button in Microsoft 365 apps | Microsoft Support
2. Activate Office for Windows | Microsoft Support
3. Microsoft 365 subscription features aren't available in Office apps | Microsoft Support