http://download.eclipse.org/technology/bpel/update-site/Please note that the update from this location will include all the necessary Eclipse components that are needed to run the BPEL Designer. Things like EMF, GEF, JEM, and WST. If you have these already installed then most likely nothing besides the BPEL designer will be installed.
Eclipse version 3.2M5a was used for the most recent build.