I'm afraid TN2 is not currently available for Mac. We may create a Mac version in the future but we haven't announced any plans to at this time and its not currently in development.
Right now our Short-To-Medium term plans does not include a Mac version. Once we announce when development for Mac has started we will inform you here on the forums.
As previously stated above, Our short - term to medium plans does not include a mac version at this time, I have no ETA on when Support for Mac will start but as mentioned i will post here on the forums once it does.