Aparently Adobe made a booboo when shutting down the activation servers for CS2. These files are only for owners of CS2 and are not free to the general public. Seems the cat is out of the bag now though as the serials and direct links are widely available
Keep in mind that Apple dropped Rosetta support so you'll also need an older copy OSX to run this CS2
I still use 7.0
so the PC version would still be an upgrade for me.