2.0 (currenly in beta 13) is the official Empeg software. Hijack is a patched kernel that you can install once you have 2.0 running on your empeg. You can download 2.0 from here.

I don't believe you will be able to install 2.0 or Hijack with MacOS 9 and I don't think tools exist for OSX yet either.
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-Rob Riccardelli
80GB 16MB MK2 090000736