Snow Leopard was the last OS to include "Rosetta," the translation layer that allowed Intel Macs to run old PowerPC apps. For design firms, musicians, or businesses with legacy software that was never updated for Intel (and certainly not for Apple Silicon), Snow Leopard is the final resting place where that software still functions.
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Compared to its predecessor, Leopard, Snow Leopard actually freed up about 7GB of disk space after installation. Mac Os X 10-6 Snow Leopard Download Dmg