If nobody has them, you can find some of them available on various sites by searching for Leichnam Photoshop Brushes.
They were originally licensed CC by-nc-nd, so it's perfectly legal for someone who has them to repost them as long as they are properly credited and they carry the same license.
I thought that was peculiar, too. But the Creative Commons isn't really designed to protect tools, so I'm not sure exactly how it applies. It would probably take an actual legal precedent to resolve it.
In any case, I just wanted to make clear that reposting the brush packs here is permitted use.