The absolute last 32-bit compatible version released was Serato DJ Lite 1.0.2 . However, even this version typically requires at least OS X 10.11 (El Capitan) . Recommended Alternative: Serato Scratch Live
Once downloaded, run in Terminal:
Before the "Lite" branding, Serato offered Serato DJ Intro , which was designed specifically for this era of hardware and software. Version 1.0.1 of Serato DJ Intro explicitly listed Mac OS X 10.6.8 as a supported operating system. serato dj lite for mac os x 10.6.8
– If your Mac supports it, install OS X 10.10 (Yosemite) or 10.11 (El Capitan) on a separate partition. Then you can run an older version of Serato DJ Intro (not Lite) or Mixxx. Check your Mac’s firmware: 2009 MacBooks often cannot boot a USB installer for High Sierra. The absolute last 32-bit compatible version released was