Download both the App and the KeyGen, save it to your computer, Desktop, My Documents, Where ever is easiest for you to find it, etc...Extract all files in the Photoshop CS2 9.0 zipped folder to your desktop (Desktop is just easier to get to), It will create a folder called Photoshop CS2 9.0 containing the extracted files.

Open the folder then find the Adobe icon called,

Setup
Auto Play
Adobe Systems Incorporated

Double click that icon. A nag screen will appear and prompt you to choose which prog to install, choose (The first prog on the list, Photoshop CS2, it will automatically intall the other appz during the install). Then you will proceed to choose your language and so forth, Click Next. You will be directed to enter a User Name and Oganization (Enter any name and/or Organization), click Next.

Then choose option (I have a serial number), leave it just like it is and open the KeyGen, copy and paste the Serial Number which will appear in the KeyGen automatically! Be sure to leave the KeyGen open, (Do not close the KeyGen)!

After pasting the serial Number into the App, click Next, then choose (Activation Options) and click (Activate by Phone), when you choose this option it will give you an Activation number, copy and paste that number into the Activation Number field in the KeyGen, then click (Generate Authorization Code), an Authorization Code will be generated, you will enter that Authorization Code into the App where it specifies to do so, click next and so forth and viola, it installs the rest of the way!