Currently, Pro Tools 12.6 is compatible with Mac OS X 10.11.6 (El Capitan), 10.10.5 (Yosemite), 10.9.5 (Mavericks), but has not been qualified for macOS Sierra.
Pro Tools 12.6 available
Currently, Pro Tools 12.6 is compatible with Mac OS X 10.11.6 (El Capitan), 10.10.5 (Yosemite), 10.9.5 (Mavericks), but has not been qualified for macOS Sierra.