To anyone wondering about this, I have figured it out.
Firstly, one has to make sure that the Earth CFG file has the instruction "isHomeWorld = True" changed to "isHomeWorld = False".
Secondly, the RSS file " RSSKopernicusSettings.cfg" should not be used as it deletes all the default planets (!Body,* {}) and removes all the default launch sites.
I will be working on adding the RSS launch sites, if possible, once I get all the planet CFG files sorted. I can post an update, or start a detailed thread, if anyone is interested.