As we continue to upgrade Rocket League with new technologies, it is no longer viable for us to maintain support for the macOS and Linux (SteamOS) platforms. As a result, the final patch for the macOS and Linux versions of the game will be in March. This update will disable online functionality (such as in-game purchases) for players on macOS and Linux, but offline features including Local Matches, and splitscreen play will still be accessible.

TL;DR, Mac version isn't out yet but as long as you've claimed it, it'll be yours for free on release.-Epic Games Player Support. August 14, 2020, 14:59 +0000. Hi dear, I hope you're having a good day today. My name is Zulu Charlie from Epic Games Player Support, thank you for reaching us! Once the Epic Games Launcher comes up; sign in with your Epic Games account. Now on the spot where you used to get the ‘Unsupported OS’ error you will find the game to be installing itself actually. Please refer the below screenshot for reference. I bought the new DLC last week from Epic games, not knowing that the Mac patch to run it was a week behind, now that the Mac patch has been applied Epic games says the DLC is not supported on my OS (Mac).

If you purchased Rocket League for Mac or Linux on Steam, the game will still work with full functionality when installed and played on a computer running Windows 7 or newer.

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Additional information can be found in the support article here.