This isn't actually an update, but is a fix that will allow you to log in to the relocated bungie.net server. For this fix to work you must be running the latest version of Myth II: v1.3 for the PC, v1.3.1 for the Mac. After you update try connecting to bungie.net. If you're unable to connect, download the appropriate file from the right column and follow the instructions below.
Your download contains 2 files, one called "bungienet" and one called "Bungie.net DNS". Move the "bungienet" file into the folder called "preferences" found inside the Myth II folder. This file may already exist in this folder. If it does, overwrite it, you need the one you've just downloaded. Then move the "Bungie.net DNS" file into the folder called "plugins", also inside the Myth II folder. Log in to bungie.net.