Download the latest version of the Ilk client here.
Ilk is written entirely in java, and it's only dependency is jogl (version 1.1.0). By following these short instructions, you may be able to run Ilk even if there is no release for it on the downloads page.
1.) Ensure you have the Java JRE 6.0 or later installed on your computer. If you don't already have it, you can download it here: http://www.java.com/en/download/index.jsp
2.) Download the jogl binaries for your operating system here: http://download.java.net/media/jogl/builds/archive/jsr-231-1.1.0/
Extract all the files in the lib folder into the folder you wish to install Ilk/bin.
3.) Download the Ilk Installer Jar here: http://ilkcardgame.aerosphere-studios.com/index.php?download=jar
Follow the installation instructions and install to the folder with the jogl files in the bin folder. It will recognize the jogl files during the update.
To run Ilk, just double click the Ilk.jar file or run java -jar Ilk.jar in a terminal.
There is no guarantee this will work as I haven't tested Ilk on operating systems other than the ones with releases, but if it works, you can post here and let me (and others) know.