Simply download the faxien bootstraper for your platform from Google Code and run it.
$ sh ./faxien_launcher # installs to /usr/local/erlware
By default, the installer places all files under the prefix /usr/local/erlware.
You may add a single argument to the launcher script to specify an
alternate prefix.
$ sh ./faxien_launcher /opt/erlware # installs to /opt/erlware
Also, it is a good idea to add <prefix>/bin to your PATH to be able
to execute Erlware applications without typing the whole path to them.