To install please do the following:
Quit Illustrator
Now:
Follow the step-by-step guide to setting the Astute Manager up on macOS
Follow the step-by-step guide to setting the Astute Manager up on Windows
If you experience any problems, please refer to:
If you're not ready to move to a subscription or if you're installing legacy licenses with a legacy installer, please see the Unified Installer Installation Guide.