If you're running on an ubuntu based linux distribution, you can install via Duck Launcher's ppa (personal package archive), simply type these 3 commands in a terminal:

sudo apt-add-repository ppa:the-duck/launcher
sudo apt-get update
sudo apt-get install duck-launcher

Then, simply run duck-launcher in a terminal.

If you'd like to install Duck Panel with it, just run:

sudo apt-get install duck-panel

Unfortunately, other platforms are not officially supported.