Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Since Office 2019 and Project 2019 are already associated with a Microsoft account, reinstalling does not require the original disk or product key.
Follow these steps:
- Go to the Services & subscriptions page: https://account.microsoft.com/services.
- Sign in with the same Microsoft account that was used to activate Office 2019 and Project 2019 originally (this is critical; other accounts will not show the products).
- Under Services & subscriptions, look for Office 2019 (for example, Office Home & Student 2019, Office Home & Business 2019, or Office Professional Plus 2019) and for Project 2019 if it was purchased as a separate product.
- When found, select the Install button next to each product to download the installer.
- Run the downloaded installer(s) and follow the prompts to complete installation.
If Office 2019 or Project 2019 were obtained through a special program or third party:
- If purchased through the Microsoft Workplace Discount Program (Home Use Program), sign in to the Workplace Discount Program order history page with the work email used for the purchase and follow the instructions in the Workplace Discount Program article to install or reinstall.
- If Office/Project were preinstalled on the PC and previously redeemed, they should still appear under the Microsoft account’s Services & subscriptions page; use that account to reinstall.
- If the products were bought from a third-party seller and there are problems with the product key (for example, blocked or invalid), follow the guidance in the product key help article referenced in the context.
The registry entries and product key found locally are not needed for reinstalling; the supported method is to reinstall from the Microsoft account that holds the license.
References:
- Where to enter your Office product key
- Download and install or reinstall Office 2021, Office 2019, or Office 2016
- Install or reinstall Office or Microsoft 365 through Microsoft Workplace Discount Program
- How to reinstall Office & Student 2019 - Microsoft Q&A
- I just bought Office for Home and Business and now "No license found" - Microsoft Q&A