Apple dropped support for 32-bit applications with macOS Catalina (10.15) in 2019. Legacy Photoshop CS versions are built on older architectures that modern operating systems cannot execute. Apple Silicon Transition
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Even if you locate a clean, virus-free legacy DMG file, running it on modern Apple hardware is nearly impossible. Modern macOS Architecture Apple dropped support for 32-bit applications with macOS
: PowerPC G4 or G5 Macs that cannot run modern macOS versions. virus-free legacy DMG file