Using Sdk On Expired Trial S’abonner

I am a developer using the SDK to print some Bartender labels in a .Net program. I have been using the evaluation version and having success. But now, my evaluation has expired, and I get an error on the command btEngine.Start. The error is: “The BarTender engine could not be started. Possible reasons are …”

I can go directly into BarTender via the Programs Menu, but I can’t start it via the SDK. Does this capability expire when the license expires? Is there a way to extend this for a longer period. The Customer I am developing for will be purchasing the software.