Hi again So finally I got the batchfile and unity working (don't ask me how - I installed and uninstalled several versions of unity and now the server.exe is running with Unity 5.4.4.f and blender). So next question: how does the client connect to the now running gameserver/loginserver?
Because there is an error: "Cannot connect to spellborn network"
Only change the IP adress in Program Files/The Chronicles of Spellborn/etc/client/sb_client.rc?
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Edit: Yes, after choosing the right IP for sb_client.rc the login server is working as intended.
 - Created an account with the login server. (see command.cs file in the loginserver folder)
 - Can see the universe selection screen with the correct server after login in with the new account.

Unfortunately next error: after "enter universe" the error "Failed to select the universe server" pops up.

Does anyone have a suggestion to solve that?

Edit: Choosing the right IP in the config does solve the problem