install photoshop

[CFRAZER]

After downloading photoshop elements 4.0 to my macintosh ppc g3 I tried to restart as the process promted me, however, I recieved the following error and cannot use my software;

error message: your photoshop elements user name, organization, or serial number is missing or invalid. The application cannot continue and must exit now.

What should I do?

[sinclair_tm]

Um, you can't download Photoshop, you have to buy it, and when you do, Adobe gives you the serial number you need to use it on a card in the box, as the installer asks for it when you run it from the CD it comes on.