For older "all-in-one" controllers like the Vestax VCI-300 or Numark NS6, ITCH 2.2.2 is compatible with Snow Leopard.
Running Serato on Snow Leopard isn’t a free lunch. You need to understand the trade-offs. serato dj lite for mac os x 10.6.8
Due to significant changes in both hardware technology and software architecture over the last decade, modern versions of Serato DJ Lite will not launch or function on this operating system. For older "all-in-one" controllers like the Vestax VCI-300
If your heart is set on (the modern, free, frequently updated software), you have two choices: frequently updated software)