My problem is similar. I upgraded to a 4.4.4 phone and it would not let me access the App on my SD card (!), but I did not know how to get all my places/locations I have saved into the new version I had to download onto the new phone. Please make a "backup" option. Suggest (like a number of other apps) you set up a "Save to cloud" feature.
files are in folder android/data/com.mapfactor.navigator/files/navigator/ files you are most likely to backup are favourites.xml vehicle_profiles.xml routing_points.xml