I dunnos...

I dunno if it suits your needs, but have you given GIMP (Gimp.org) a try? ^^;

It's a free open-source PS-alike that a lot of furs on this site favour (dunno if you've tried it or not but thought I'd throw it out there). I've used PS before and I find GIMP to be a lot easier to work with, but I also hear that it DOESN'T have (insertobscurefunctionneededbyanartistforsomereasonoranother) so like I said... may NOT be what you're lookin for. I reccommend giving it a shot anyway though! ^^

And besides that, if you're looking for PHOTOSHOP (dead set on it)? Try Pirate Bay! ^^ There's like... ten? Twenty listings for 'Photoshop Mac' at least!

If your looking to torrent it then go to demonoid.me. I just checked and there's a download on there for Photoshop CS5 for Mac in English with plenty of seeders

-crosses fingers- Thank you... I hope this works!

No problem, good luck to ya!