Currently confd ships binaries for OS X and Linux 64bit systems. You can download the latest release from GitHub
wget https://github.com/kelseyhightower/confd/releases/download/v0.6.3/confd-0.6.3-darwin-amd64
wget https://github.com/kelseyhightower/confd/releases/download/v0.6.3/confd-0.6.3-linux-amd64
Copy the confd binary to a bin directory in your path.
sudo mv confd /usr/local/bin/confd
sudo chmod +x /usr/local/bin/confd
Get up and running with the Quick Start Guide.