Adobe Illustrator 10 -mac- Serial Updater Site

If the loop persists, your serial number is blacklisted (common with pirated keys). You will need a legally purchased, unused serial from an original retail box.

Adobe Illustrator 10 is not designed for Intel-based Macs or macOS 10.15 (Catalina) and later. PowerPC Needed: Adobe Illustrator 10 -Mac- Serial Updater

For many designers, Illustrator 10 represents the peak of "Classic" Adobe—software that was robust, feature-rich, and yours forever once you bought the license. If the loop persists, your serial number is