If you haven't yet switched to the subscription or if you are still using CS6, please refer to the older unified installer installation method and please note that the subscription is not CS6 compatible.
Subscription customers or those wishing to trial it, please quit illustrator and install with Astute Manager which can be downloaded on the "Astute Manager" tab/page of your Customer Account.
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.
Now depending on your computer follow either:
Detecting and adding plugins to new installations of Illustrator
If I quit or uninstall the Astute Manager, will I lose my plugins and activations?