AIR installation on mac - what am I doing wrong?

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Now to get Qobuz working :-(

I've found Qobuz Desktop Player to be a bit finnicky about selecting Devialet AIR as the output device.  For some reason, I have to re-do this each time I start the desktop player, and furthermore I have to first select a different output device then re-select Devialet AIR otherwise it doesn't seem to have any effect.  (This was true on Snow Leopard and is also true on Yosemite.)  May be unique to me, but thought I should point it out to save possible head-scratching...