You can no longer redeem the 27-character alpha-numeric PIN shown on the product key card to retrieve your product key. However, if you already have your 25-character product key and a disc to install Office you can still do that.
If you need help installing Office 2010, see Install Office 2010 and Activate Office 2010.
If you'd like to upgrade to the latest version of Office, find out what's new in Microsoft 365 or what's new in Office 2019. To learn more about the differences, see What's the difference between Microsoft 365 and Office 2019?