For the lightning detector's microcontroller, there are two files you will want to get. The assembler source code and the hex file that is used to program the device.
I realize that some electronic hobbyists will not have a PIC microcontroller programmer. There are some simple hardware circuits that can built to program PIC's though. Here are a list of links that may be helpful:
If none of the above links prove helpful, contact me and we can work something out so that you can get a part programmed.
To set the comparator's voltage reference to the value I wanted, I wrote a short program in Ruby to print a table of configuration numbers and the resulting reference voltage. Here is a link to the program and its output. This data isn't in the 12F629 reference manual; I wonder if it is in the chip's family reference manual? I bet it is :)