How can I find and install GarageBand 6?

My buddy can’t run OSX 9 because the laptop is too old to handle it well, and he really wants Garageband, but he needs v6 to go with his version of the OS. He paid for the current one, but found that the OSX 9 and the other software on the computer made it unusable. So he’s not trying to find it for free: he already paid for a version.

Is there anywhere to find v6? I’m usually pretty good with Google, but I can’t find it.

I don’t think you are going to find it through “proper” channels.
Get in touch with a local Mac user’s group - someone will have a copy.