Because this software is over 20 years old, it is considered "abandonware." It lacks modern security updates and will not run on any current Apple Silicon (M1/M2/M3) or modern Intel-based Macs without specialized emulators like SheepShaver running an older OS environment.
The modern version includes AI tools (Generative Fill), cloud sync, and native Apple Silicon support. It runs on macOS Ventura and later. Adobe.Photoshop.CS.Mac.OS.X.dmg