Websites promising “updated serial numbers” or “working cracks” for Illustrator CS3 are often traps. They may deliver:
Previously, Adobe provided a special "non-activation" version and unique serial numbers for existing customers to keep using the software, but that service has also been discontinued. Security Risks: Adobe Illustrator Cs3 Serial Number UPD
For a period, Adobe provided a "special version" of CS3 that did not require activation, along with a replacement serial number for existing owners. However, recent reports indicate that these download links and replacement keys have also been largely removed from the Adobe Support site . Adobe Illustrator Cs3 Serial Number UPD