First, thanks for trying to help.
I'm not new to the pro-audio world ... I built my own studio, and have put together more than one DAW/music creation workstation. I'm familiar with EQ and DSP (been doing both, in hardware and software, for longer than I care to think about).
All I needed to know, and finally found, was this:
Microsoft XP, Vista, Windows 7, Windows 8(32 & 64 – bit) win
Mac OSX 10.5, 10.6, 10.7, 10.8 (32 & 64 – bit) mac
Sound Hardware: Audio Hardware with OS compatible drivers.
AU, AAX Native, RTAS or VST standard plug-in compatible playback software
The supported plug-ins types being the most important part ...
Anyone running this on the current (10.11) build of OS X?
I'm on OS X 10.11.1 running on a MBP Retina laptop. I have the trial version of the software. Once you install the plugins -- I'm using Audio Units -- then you access it in your music software. When you click on "Configure" for the first time, you'll enter the validation code they send you in the email to activate it -- and then you can configure for your headphones and explore various parametric alterations to the correction curve.
I'm not sure why, but I was unable to perform the validation step with Audirvana Plus. Had some back forth with the support team, checked my firewall, and etc. In my case, I have a number of music players, so I tried Fidelia -- and was able to activate it instantly. Once validated, the AU was functional across all my music players including Audirvana. Not sure if that was something about my configuration or not.