Sorry I was afk.
Go to google, and type in "bit torrent" if you already have it skip this step.
When you open the torrent application, there should be a little search button space thingy in the top Right area of the screen.
Type in "Photoshop CS4" and it should open a webpage.
It will give you a list of websites that will allow you torrent said program.
Click on the one that looks the least likely to have a virus, or has a high rating (if they have ratings, i don't remember).
After that it should download in about an hour, and then open the containing folder, run the install exe.
Go to google and look for a serial key, and insert it to the designated area, and its my advice, that you don't close out the application ever, or as few times as possible, because most likely the serial key won't work because the internet sucks lol.
So yeah. Sorry I wasn't there, I was talking with my dad about housing next year, and he decided 20 questions would be a fun game. ~___~