So I uninstalled Illustrator CS6, then I ran the Creative Cloud app for installing the last version (Illustrator 23.1.1). I have an Enterprise license allowing me to install the newest versions of most Adobe software. I have some related advice, though (hope it fits in here). No, I did not manage to run Illustrator CS6 in macOS 10.15 Catalina, even if CS6 is 64-bit.
