Because of the new DRM implementation, you will need to run the latest version as the others most likely will not work properly.
So far the newest version seems to be working for all classes though may not have the best combat routines(they are working on a even better one than trinity based on popular builds).
If you are experiencing difficulties when botting or errors, post them in the support forums with logs like Phelon suggested.
But NOTE THIS, if it says waiting for nav server, there is no error and there is nothing you can do about it at the moment as they keep working to improve on that part.