I bought Photoshop, Illustrator, and InDesign CS2 a long time ago. Still use it since it's mostly for hobby and very occasional freelance. There's a tiny bit of jank running it on Windows 10, but otherwise it starts quickly and runs perfectly. The only thing I'd change if I could is to have a 64 bit version. This one chokes occasionally on very large files. But I don't deal with those enough to invest in the subscription.
For Mac, CS2 was PowerPC binary. It ran on the first Intels with Rosetta, but that's not usable for a long time now. Mac users, if they want Photoshop, they must go for subscription.
CS6 was the last. But even on Intel processors, running it on Catalina or later is crash-prone and requires a fair bit of hacking around. The main problem is that there were still chunks of 32-bit code in there and macOS has stopped supporting that.
