For now, the server is in pre-alpha, it is very prototypical and is likely to be reset anytime.
The client is also evolving regularly, so updates will regularly occur.
All of this has not been secured yet so never use a login/password couple which you're using somewhere else!
Clients are on this page.
See the detailed article how to install a game client for linux.
Downlaod the Mac client.
This part is probably obsolete.
Unzip the client, place the data zip in this folder, and launch khanat_update_local which will unzip khanat_data and place it at the proper place. For this to work, the khanat_update_local, Khanat.app and khanat_data.7z have all to be in the same folder. Launch the client once it's done.
Download the installer here.
Launch khanat_setup.exe from any folder and follow the provided instructions.
Note the error message you get, come on IRC and copy it.
If you meet strange bugs, the simplest way is often to delete the content of some folders.
The first world is the Khanat, which the server will try to look like. Lost in the Mists, the Dreamers shape a new World.
When you're installing the game client as explained above, the access to the server is already set-up.