I have only ever installed manually, so I just drag files (on Mac and Windows) to specific folders per the PDF. It's actually SUPER easy. Just remember to COPY the files to the new locations and not MOVE them. That way, your original stuff isn't disturbed for when PS is updated and you need to re-install.
I got the originals so long ago, that I may very well have downloaded them from Russel Brown's page, I don't remember. I do remember that I was surprised to learn that the script and functionality was available again (after it wasn't for so long), and I also remember that I did download it from a reputable source (not a torrent or download.com or something like that). We used this setup religiously when I worked at Apple, and then it was gone... It was tough to get past.
To restate: The SAME script pack installs on Mac and Windows. I just haven't (yet) tested this specific install on Mac. I can say it runs on Windows.
PM me if you need help installing manually or if you cannot find the script pack v2015 3.2b5.
