How to install Emagone?
Install Java first!
Download installer for the Launcher.
Execute the just downloaded installer.
In the Launcher, choose the game version you like and press install.
Do I require Java?
Both, Emagone and the Launcher, run on Java. So yes, you do need Java to run Emagone and the Launcher.
Note: Currently the installer requires Java as well.
To install Java, visit: https://www.java.com/en/download/