I have an old airport express (g) I want to join the network just for wireless printing purposes. Because Apple is Apple, I downloaded the old AirPort Utility and a script to get the thing to run in Yosemite. But no networks are present to join, and if I type in the name and security manually, it will restart but not appear again until I reset it. Edit: "Solved" it by making it ethernet-only and connecting it directly to the router. Printing works.