collector169, please don't threadjack. Your question belongs in the Plugins/Viewers forum. You should also consult that section of the manual since you're seeking information on Mpegplayer.
T-random, I don't quite follow. It sounds like you installed the bootloader, yet you say that you didn't hit the "install bootloader" button. I'm also unclear on what .hex file you think you need.
What happens when the bootloader runs? Does it give you a message?