AirPort Utility 6.3.1 will not allow me to install/join multiple AirPort devises (Extreme/Express) on our new Mac Book Pro with OSX 10.7 I can install one devise then when I try to have another one "Join", the AirPort Utility 6.3.1 does not show it as being available to join. I have downloaded Utility Version 5.6 and it will not install on my Mac Book. I tried to delete Utility v6.3.1, but OSX 10.7 will not allow me to delete it and install Utility v5.6. I really need to have the new Extreme as our network and I need to join two AirPort Expresses to the Extreme's set up. I've never had this as an issue before now. The Utility always indicated that there was another devise available to join before I updated v6.3.1. Any help will be appreciated.