...
Install Data Integration/ETL
Download [pdi-ce-4.0.0-stable.tar.gz|http://downloads.sourceforge.net/project/pentaho/Data%20Integration/4.0.0-stable/pdi-ce-4.0.0-stable.tar.gz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fpentaho%2Ffiles%2FData%2520Integration%2F4.0.0-stable%2F&ts=1295426768&use_mirror=voxel]
Extract it to a location we will call $PDI_HOME (the root of the Pentaho Data Integration)
...