MPVI relicensing

I have two MPVI's. I just sent one in to upgrade to a MPVI2. I have a few cars that I need to retune. These cars were licensed with the MPVI that I sent in. I want to use the second MPVI I still have to retune these cars. I bought credits for the second MPVI I still have, and read the vehicles with it. I am able to open and save changes to these files. When I go to flash with the second MPVI, I just get "unlicensed vehicle" in the vehicle writer window with no option to apply credits. Is there a way to bring up the licensing window?

Yes, delete your license.dat file found in your documents-hptuners-settings folder and it will then allow you to license it.