For .NET core (I mean without framework) you have to include the agent in the build process of your application. Ther's no "real" installation task. As for the upgrade process it's pretty straight forward. Just chose upgrade. all of AppD's agents can be installed as upgrades on pretty most any previous version. If you have really really old agents there might be issues since I remember that they changed the config from web.config to it's own xml config file but that was a long time ago.
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