I'm attempting to use Seagull Scientific's BarTender program to install another Zebra ZP 450 on a laptop that already has another Zebra ZP 450 installed and connected. I don't get very far until the program asks if I want to upgrade the existing printer as opposed to installing the new one. This definitely seems like something I should be able to do, but I'm not knowledgeable enough to make it work. What should I do? Thank you in advance!