: Since Adobe no longer updates these older versions for 64-bit compatibility, the best long-term fix is to upgrade to a newer version or use a virtual machine (like Parallels) running an older OS like Mojave. Fixing Crashes in Illustrator 2020/2021

Catalina introduced a read-only system volume. This broke legacy workflows that wrote files to /Library/Application Support/Adobe without permission. Modern Illustrator versions handle this fine, but older automation scripts will fail.

Tips for Smooth Use

For designers using Adobe Illustrator, this update was a major event. While Adobe has since moved on to newer macOS versions (Ventura, Sonoma, and Sequoia), millions of users remain on Catalina due to hardware limitations or legacy workflow requirements.