Navdata pro is not a 100% bug proof software.
You must make sure you have selected, downloaded and installed "jeehellware support".
If after making sure of all that there is still no trace of a navrecord.dat file in C:\Users\username\AppData\Roaming\JeeHellWare, Nthen you must try to find where the installer put this file, as it msut be somewhere on you computer. Then you can manually put it in FMGS\navdata\navadta1 & 2 folders.
Regards,
JL