The 6.3 version of Apple AirPort Express for Mac was available as a free download on our website.
From the developer:
AirPort Express Firmware Updater 6.3 for Mac OS X
This update will auto launch when downloaded, and will offer the opportunity to update a number of base stations.
This new AirPort firmware update contains versions 5.7 and 6.3 for the Extreme and Express base stations, respectively.
It addresses reliability and resolves issues with AirTunes, AirPort compatibility, and issues with some third party Routers.
You may want to check out more software for Mac, such as Express DigiBooks or Apple Configurator, which might be similar to Apple AirPort Express.
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