Padshop 2 and Groove Agent 5 use Steinberg Library Manager, unlike the older versions of Padshop and Groove Agent. Retrologue 2 also uses Steinberg Library Manager from 2.2.20 onwards.
If you already have additional content installed and working I can’t think there is any need to reinstall it. However, if you need to reinstall the content, I expect you will need the newer installers to get things correctly set up with Steinberg Library Manager.