Adobe Illustrator Macos Catalina [patched] -

Catalina strictly requires 64-bit applications. Older versions of Adobe Illustrator (like CS6 or earlier) contain 32-bit components, including their installers and licensing engines. They will not launch or install on macOS Catalina. Supported Illustrator Versions

If you must use macOS Catalina but want to avoid a Creative Cloud subscription, consider modern, one-time-purchase vector design software built natively for 64-bit macOS environments: adobe illustrator macos catalina