Please print according to the instructions – the print-friendly version must be opened within the PC Viewer (if Windows) or Mac Viewer (if a Mac user) and then sent to the printer by clicking File > Print. In some cases the app is blocked by the system’s antivirus, so it’s also recommended to either disable the antivirus temporarily or to whitelist the app. It should print without any problems then as we test them before sending them out, but please send a screenshot of the error message if there are any problems.