You ran the patcher when Illustrator was open. Force quit Illustrator and the Adobe GC Client process in Activity Monitor, then re-patch.
install adobe illustrator cc 2020 on mac preactivated patched You ran the patcher when Illustrator was open
If you encounter any issues during the installation process, here are some troubleshooting steps you can try: You ran the patcher when Illustrator was open
: Ensure your Mac meets the system requirements for Illustrator CC 2020. You ran the patcher when Illustrator was open