Error: "Your activation key for Sage 50 has expired. Please start Sage 50 on the Sage 50 company data server, [your own computer name], to activate." Error when opening program after installing Sage 50—U.S. Edition 2017 or 2016 on a workstation. Server install and activation is complete. Let’s look at how to resolve errors when your activation key for Sage 50 has expired.