Subscription users or those wishing to trial it, please quit Illustrator and download the Astute Manager from the Astute Manager page.
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
Please note:
If you're beginning a Free Trial, click the "Install All" button at the top right of the Astute Manager (if you prefer to install the plugins individually, you can click on the individual install button beneath each plugin).
If you're moving from a Trial click on "Upgrade" to purchase your subscription then after paying, return to the dashboard and click the "Install All" button at the top right of the Astute Manager.