I don't know, but since this was adapted to deal with OS X 10.10 and higher, it may not work with 10.9.x and lower (italics mine)...
Quote:
12.6.1 Release Notes
HD Driver
Updated Core Audio Driver for HD systems
- Pro Tools 12.6.1 includes a newly made HD Driver that is adapted to the significant changes made in Mac OS starting with OS X 10.10. This new driver restores Core Audio support and is included with Pro Tools HD 12.6.1.
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