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I don't know enough about the project to say anything conclusively but it appears as though the SharpSky_4550.hex file is designed to be flashed via the bootloader software. If this is the case then it can not possibly include a bootloader itself because the entire principle of a bootloader is that it can write program memory not assigned to itself.
Anyway a bit of searching and it looks like you need to get MCHPUSB flashed on your chip first. What I don't know is if there was any customisation done to MCHPUSB or if you can simply follow any of the online guides of how to do it. It would depend on the hardware (specifically the pushbutton to fire up the bootloader). Then once the bootloader is working you should be able to use the bootloader software to flash SharpSky_4550.hex
Hopefully someone more familiar with the project can chime in. This is about where my knowledge with PIC comes to an end.
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