The Astute Manager is designed to install and deploy the current Astute Graphics plugins issued as part of the 12 month subscription. It doesn't read any historic legacy licenses (pre-"Annual Service Plan", purchased up to 14 September 2019) that may still be on your machine – the only licenses it knows are the ones associated with the Astute Graphics account you're logged in with.
If you're not ready to move to the subscription or if you're installing legacy licenses with a legacy installer, please see the Unified Installer Installation Guide.