Tuner needs a connection to a Civ5 running game, and it uses a TCP/IP connection to do this, with the loopback address 127.0.0.1. This will only work if your computer thinks it has TCP active, which usually means it has to have an active ethernet or wireless port. It doesn't need to be connected to anything beyond a router. I'm not aware that the other tools need a network connection. Have you tried the Save Map option when you open the Save Game menu? It works here - creates a saved map that you can open in WorldBuilder.