Darkfire RPG Java Executable 1.1.1 (Linux, Mac OS) file

Step 1: Install a Java Runtime Environment (JRE), version 7 or later.

In order to check if Java is already installed, type on the command line:
java -version

If Java hasn't been installed yet, execute the following command:
sudo apt-get install default-jre

This will install the Java Runtime Environment (JRE).

For Mac OS read this guide on how to install java.

Step 2: Download the game client. It is an executable java archive (jar).

Step 3: Start the game by double-clicking on the downloaded file "Darkfire RPG 1.1.0.jar".

In case double-clicking doesn't work, you can alternatively type on the command line:
java -jar "Darkfire RPG 1.1.1.jar"