Print Integrated Shipping Labels > received a warning pop up box UPS Thermal 2442 Plug-in Error... with message "No UPS Thermal Printers are installed."

Given the user has followed the instructions provided in this link in our NetSuite Help Center:

Order Management : Shipping : Shipping Integration with FedEx, UPS and USPS/Endicia : Printing Integrated Shipping Labels With a Thermal Printer

Additional step to do: 

Go to Start > Control Panel > Programs > Uninstall or change a program > then uninstall any UPS Thermal Printer Plugin

User may now successfully print labels.