Microsoft Windows users can simply download and run This is not an installer, but the client itself. Nothing will be installed permanently on your computer. You can uninstall simply by removing the downloaded .exe file (size is around 13MB).

GNU/Linux x86 users can simply download and run (around 10MB).
After downloading you need to make the binary executable like this:

chmod a+x deliantra-gnu-linux-x86.bin

And start it like this (when deliantra-gnu-linux-x86.bin is in the current working directory):

./deliantra-gnu-linux-x86.bin

x86_64/amd64 users might have luck with compatibility packages ia32-libs-gtk and, for nvidia, nvidia-glx-ia32 package.

After starting Deliantra, you should adjust your Video Mode in the Graphics tab, enter a Username and Password in the Login tab and press Register / Login. You must be able to connect to TCP Port 13327 on the host gameserver.deliantra.net.

To register a new account, simply chose a username that isn't used and follow the instructions given by the server in case the username already exists.

If you get stuck, it is always good to ask other players who are online. To chat, activate the Chat-3 tab in the Messages window and hit your Return key to activate the chat prompt, enter your message/question/greeting and hit Return to send it.