, Photoshop CS was the eighth major version and the first to carry the "Creative Suite" branding. Today, it is considered "abandonware" by many, but finding a legitimate key is more complex than it seems. Why Your Old Key Might Not Work
Adobe shut down the activation servers for Photoshop CS, CS2, and CS3 years ago. This means that even if you have original installation discs and a legitimate serial key, the software cannot verify itself online to complete the installation. No Longer Sold: adobe photoshop cs 80 serial key
If you previously purchased or registered a legal copy, you can try these methods to find your serial number: , Photoshop CS was the eighth major version
If you registered the product, log in to the Adobe Account Products page . it is considered "abandonware" by many