Hi,
The best way will be to Build the projects in MPlab to create a new .hex files.
As you can see from the screenshots the Config parameter CP_ALL is specified, this protects the code from people pirating the code from the chip.
However it can sometimes cause problems when reprogramming the chip so it might be better to turn it off by CP_OFF.
You do not say what programmer you are using, but if it works you should have no problem programming any .hex file.
Billyboy.hex is just the rebuilt and renamed LedStrobe program code
If you have any text / circuit details/ links of the projects they would be appreciated.
( you can PM the details if you do not want to broadcast them)