(Note: I think I was the first person to convince Microchip to send such information without a signed non-disclosure because I certainly recall Chip's shocked reaction that year when I told him I had a copy after spending a few weeks convincing Microchip to provide it and told him I hadn't needed to sign anything to get it.) In your case, go to the main Microchip PIC18F4550 web page and find the "Documents" tab and click it. Since about 1990 or so (might be \$\pm 1\:\text\$ around that point), Microchip has been very good about providing details on how to program their devices. But I can point out the issues, at least. No solution - that will be for you to work out. Now that I've taken a moment to recall some details, I think I can spell out your situation a little better. It's been many years since I was programming the PIC18F and I had to go back to your datasheet to refresh some of my memory about it.
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