I wonder if someone already tried to use the same Brain over two different OS?
MacBook Pro (Retina, 15-inch, Early 2013)

2,7 GHz Intel Core i7

16 GB 1600 MHz DDR3

Not at the same time, but yes, I was using the same Brain database at work (Windows) and then when I came home (OS X) for years.
macOS 10.13
TheBrain 9.0.250
Yes, it's certainly possible and many people already do use TheBrain on multiple OS throughout the day/week.

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