OK, I originally posted away from my computer. My MCS has the 18F4520_20.hex file in it. I have MCS version 3.0.0.5. Which version do you have?
I have just tried the 18F2520_20.hex file, and got it to work. (I don't have a 18F4520 to try).
You should be able to update MCS over the internet. Not sure if that would update your .hex files, but I don't see why not.
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