Afraid I’ve got a bit of bad news. It looks like the Mac/Linux/SteamOS versions of TRON RUN/r have been cancelled.

Development on these versions were already well underway, not long after the release of the Windows version of the game on Steam. They briefly became available on the Steam store page (for one day) back in March 2016, but were then quickly pulled. (Note the Apple and Linux/SteamOS logos on the archived store page.)

Updates to the Mac/Linux/SteamOS versions continued behind the scenes until May 2016, but then stopped. So from June until now (October 2016) there were no updates at all.

However, a few days ago another update occurred. They were removed according to SteamDB, and are no longer considered supported versions of the game.

Something else I’ve noticed, is that development on the Windows version of the game stopped in July after the Outlands DLC was released. So no updates for the last two months. Prior to this, TRON RUN/r was constantly being updated behind the scenes. But it might be jumping the gun to say that there may be no more updates or new DLC, so I’ll keep an eye out to see if the situation changes.