OK, I got it and it's a dol file, so the folder that gets extracted you put on the SD card in the apps folder, and run from homebrew channel. I'm guessing that once you load superdump you have to insert a empty sd card to dump to. It would be easier if it was a wad file that installs as a channel, you may want to have a look about the web and see if you can find a superdump.wad to install as a channel if the homebrew channel version don't work. Or find a thread around here explaining it. I have not used it. But I would give the HBC version a try first.
I found a thread on it, >>>
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After reading that thread, it looks like HJsplit might not work to put the parts together. I think that HJsplit only works if the file extention is .part1, .part2, .part3, ...etc.