If you have Homebrew already, it should be immediately evident. Or, if you are the reckless or impatient sort, you can do what I did and press on by entering brew doctor into the terminal. I have only been diving into the dev game since the start of the year (and until today was only familiar setting things up on PC/Linux), so rather than potentially leading you astray, I suggest you check out for guidance on all things Homebrew. As was the case for me, there's a chance you may already have a version of Homebrew installed. It appears that version and the version instructed above are just two different roads leading to the same destination. meaning I had installed Homebrew according to the instructions on their actual site. The next steps will walk you through the installation steps.
If you try and click the Install OS X Snow Leopard icon, you’ll get the message below telling you you can’ install OS X from this volume. Prior to pasting the above into the terminal, I had used: If the restoration worked correctly you should be able to open your USB device and see the Leopard installation files. Encountered that very same issue! For me, it was quickly resolved, though: