Be extremely cautious of websites claiming to offer "Authorization Code Generators" or "Free Keygens." Activation Photoshop CS3 [CS3 is dead] - Adobe Community
: If available, you must uninstall your original CS3 and use the specific installer provided by Adobe that does not require online verification. Modern Status : As of 2020, many community experts report that Adobe has completely ended the replacement program , removing the links to these activation-free installers. Important Safety Warning
retired the activation servers for Photoshop CS3 (and all of Creative Suite 3) several years ago. Because the servers no longer exist, standard authorization codes and traditional generators will not work to activate original installations. Official Solution For a time, Adobe provided a special "activation-free" version
of the software and a universal serial number for existing license holders. Check Your Account : Historically, users could log into their Adobe Account to find replacement serial numbers for legacy products. Replacement Installer