Inflix on win10 creators 64bits gets exited when opening specified PDF

My computer is using the Win10 64bits OS, when using the free Inflix software (Ver 7.1.15) it does not matter but when I install the official license key, every time I open the PDF file identified, except the first, the next time will be escaped. I have uninstalled and reinstalled numerous times Inflix (each time reboot), but errors on still unresolved

Hi,

Can you please email us the PDF that is causing the crash along with your license key if you have purchased Infix. Please use the email address support@iceni.com.

Thanks, Simon.