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 installing legacy licenses with a legacy installer, please see the Unified Installer Installation Guide.