The first step for working with PDI, is to install the tool. You can download PDI from: Sourceforge.net
At the time of this writing, the newest released version is 3.0.3, so the file you have to download is Kettle-3.0.3.GA-nnnn.zip.
Kettle requires the Sun Java Runtime Environment (JRE) version 1.5 (also called 5.0 in some naming schemes) or newer. You can obtain a JRE for free from http://java.sun.com/.
PDI does not require installation, unless you downloaded the .exe file. You simply have to unpack the zip file into a folder of your choice. Under Unix-like environments, you will need to make the shell scripts executable. If this is your situation, execute the following commands: (assuming that you chose Kettle as the installation folder):