Beta Folder?

I downloaded Adobe Photoshop 7 on my mac osx, and the download completed. After I unstuffed the file I tried opening it, but I got a message saying 'One or more files in the adobe application support folder, necessary for running photoshop under os x, are missing. Please run the photoshop installer under os x and re-install photoshop or custom install the 'mac os 9 to mac os x tune-up'." I got another pop-up message behind it saying "could not complete your request because the serial number has expired." Right by the Adobe Photoshop 7 folder there is an empty folder telling me to put Adobe Photoshop 7 in my PS7Beta folder. Where is this beta folder? Do I have to download something else? If so, what do I need to download to open Adobe Photoshop 7. I don't understand what I need to do. Please help me and if you can e-mail me with your response at gymnastj11@aol.com as well as in this forum. If you can't e-mail me, then please just reply in this forum. Thanks