It seems all the very helpful/knowledgeable Biab users have the Windows version.
For those of you that would like to have the Mac version on your Win PC or old Win PC to provide help to the Mac users, take a look at https://www.tonymacx86.com/

The Audiophile drive will work on Mac Using Win Audiophile Drive On Mac (Crossgrade) & Win
You can use a batch converter like Win/Mac http://www.nch.com.au/switch/index.html
(FormatFactory had a bit of delay, Switch is better) to convert wma to m4a, it will convert all files/folders in the RealTracks folder to another drive or folder keeping the directory structure and mono/stereo channels.
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Free Biab Chord Picker Tool (look at the bottom of the page for the latest version.)