Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Reinstall Office Professional Plus 2016 from the Microsoft account originally associated with the product key; if the key has never been redeemed, redeem it first at the Office setup page.
Standard reinstall
- Go to https://account.microsoft.com/services.
- Sign in with the Microsoft account previously used to redeem or purchase Office.
- Locate Office Professional Plus 2016, then select Install.
- Open the downloaded installer and select Yes at the Windows permission prompt.
- When installation finishes, open Word or Excel and follow the activation prompts. This is the documented reinstall route for an account-linked Office Professional Plus 2016 license.^1^
If the product key has never been redeemed, go to https://office.com/setup, sign in with a Microsoft account, and enter the 25-character key. This links the license to that account. Then install it from the Services & subscriptions page.
If Office is not listed in the account
The correct installer depends on where the license came from:
- Workplace Discount Program/Home Use Program: Open https://www.microsoft.com/home-use-program/order-history?ocid=cmm3lqm9ryw and enter the work email address used for the original purchase. If no email arrives, check the Microsoft account Services & subscriptions page using a personal Microsoft account, not the work account.^2^
- Organization or volume-license copy: Contact the organization’s IT administrator. An authorized Volume Licensing administrator can download available products from Microsoft 365 admin center → Billing → Your products → Volume licensing → View downloads and keys. Access requires the appropriate Volume Licensing role.^3^
- Key rejected or edition not found: Do not download Office from unofficial ISO or software-download sites. The installer must match the key’s licensing channel and edition.
Office 2016 is no longer supported and receives no extended security updates, so consider moving to a supported Office release after recovering access to your documents.
References