Due to a bug related to groups in battle mode, new binaries under the name of SuperTuxKart 0.6.1a have been uploaded. For those who have 0.6.1 already installed, patches for Windows and MacOS are available, containing nothing but the bugfix. So, no need to download the whole game again if you have STK 0.6.1 installed.
Go to the downloads page
We are sorry for the inconvenience.