The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@c0rtex said:
@Skrat Where do you find the Python client?
Just google "faf python client" and its the first result. Alternatively here is the direct link: https://github.com/FAForever/client/releases
General FYI: You have to do a hard refresh to get the new theme and functions:
Windows/Linux: Press Ctrl + F5 or Ctrl + Shift + R
Mac: Press Cmd + Shift + R