A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
You need to open the DLL file in DependencyWalker tool and see if it has mangled method names [looking like...
I confirm that RakNet is still possible to work with Unity - and always will be, since it is an external DLL lib. Nobody and nothing can break...