I have AdobePhotoshop CS2 which I have used for years and when I downloaded it to my new computer it worked for 30 days and then said my trial period is over. I have the disc. I tried to re-load and it gave me the serial number, Activation number and

I have Adobe Photoshop CS2 which I have used for years and when I downloaded it to my new computer it worked for 30 days and then said my trial period is over. I have the disc. I tried to re-load and it gave me the serial number, Activation number and activation type which is normal 24:24. Then it has a blank for authorization code but I don't know how to get the authorization code. My computer will not let me use Photoshop now. Please help.