If you're experiencing issues with your AirPOS app not opening correctly on your Windows device, it's likely related to permissions. Permissions dictate what you can and cannot do on your device, and this can vary depending on the user profile you're using.
How to Connect the Star TSP143IIIU USB Receipt Printer on Windows with AirPOS
The scanner will work in Bluetooth Mode or USB Mode the default being Bluetooth. To switch between the two press the Scan/Power Button (4) and the Function Button (6) at the same time for three seconds or scan the appropriate barcode on page 9 of the quick start booklet that came with the scanner.
The Star mPOP combined cash drawer and printer can be connected to your Windows tablet or desktop with a USB cable.
The first step is to set the printer up in Windows. From the Start Menu on your Windows machine select Devices and Printers.