Please note that this is for educational purposes only!
I can only confirm that this is working for Photoshop CS4 on Macintosh
Also feel free to try this on any version of Photoshop for mac and tell me if it works and what version of Photoshop you were running. :)
Okay so what you need is a copy of Photoshop for mac i am going to supply the download link for Photoshop CS4: Photoshop CS4 Extended
Okay now that you have that downloaded after its done downloading just to be safe disconnect internet from the mac you are currently on by turning off your airport card or if you use Ethernet just disconnect the cable from the back of your computer. (Don't worry after this is done you wont always have to disconnect yourself from the internet to use Photoshop).
Okay now run the .dmg on your mac or you can burn it to a disc if you would like for safe keeping. Now once you run it it will extract and take a min just be patient. Go threw the installation which is pretty basic, uncheck anything you don't want on your computer as like certain software suites that adobe has to offer but make sure that the font pack and adobe bridge is installed.
Now once it prompts you to install the serial key make sure again that you are disconnected from the internet.
And enter one of these keys ill try to keep them updated as best as possible (if none are working tell me which one isn't working by copying and pasting the serial key and say this key does not work)
1325-0898-6772-4686-5360-0983
1325-0137-2320-2099-2753-4206
1325-0137-2320-2099-2753-4206
1325-0455-3516-5888-1430-2084
1325-0455-3516-5888-1430-2084
1325-0840-5131-4679-0853-7708
1325-0663-4082-7464-8729-4363
1325-0492-9307-6416-9947-4966
1325-0236-0132-3619-1161-1278
1325-0194-9896-6067-2376-1456
1325-0482-4411-6667-3237-2308
1325-0075-1372-5276-0759-2227
1325-0719-7836-7762-3824-2160
1325-0789-3073-5975-3595-7404
Okay now once that's done quit out of Photoshop by clicking on the start menu bar where it says Photoshop next to the apple logo then go all the way down on the list and click quit Photoshop.
This step is really important just copy and paste the red text into the terminal to avoid any errors.
To open the terminal go to the search icon or spotlight. And then search for terminal and open the terminal application. Then follow these 5 steps.
1) open terminal and type in sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts then press enter. textedit will automatically open hosts.
2) at the bottom of the hosts file add 127.0.0.1 activate.adobe.com
3) save and quit textedit then quit terminal.
4) reboot mac.
5) test the result as stated above.
Then follow the directions below
At the bottom of the hosts file in terminal add 127.0.0.1 activate.adobe.com
I CANNOT STRESS ENOUGH RESTART YOUR MAC OR ELSE THIS WILL NOT WORK!