Installing Photoshop CS4 on Windows 10 is a very simple process. You will first need to download the Photoshop CS4 installer from the Adobe website. Once you have downloaded the installer, double-click on it to begin the installation process.
The installer will ask you a few questions, such as where you want to install Photoshop CS4, and if you want to create a desktop shortcut. Once you have answered these questions, the installation process will begin.
Once the installation process is complete, you will be able to launch Photoshop CS4 by double-clicking on the desktop shortcut that was created, or by going to Start > All Programs > Adobe Photoshop CS4.
Congratulations! You have now successfully installed Photoshop CS4 on your Windows 10 computer.
Now that you have installed Photoshop CS4 on your Windows 10 computer, you are ready to start using all of its amazing features!