Due to changes in the wineskin emulation and its compatibility we are no longer able to support Mac operating systems.
We have found that Mac users have the best opportunity for running the client if they use a bootcamp setup.
https://www.apple.com/support/bootcamp/
We have also developed the new RLC2 on a native mac platform, and it is fully compatible with the latest OSX versions.
You can find out more about the client here: