Download Manual Test Tools zip from the above page, and unzip into Eclipse. The TPTP Manual tests we are currently using for the end-to-end tests will not work without this.
Download WTP 3.0 RC2 and unzip into Eclipse (if you are using the Data Manager toolkit).
Download EMF, EMF XSD Runtime, and GEF prerequisites from the above page, and unzip into Eclipse (if you are using the Data Manager toolkit).
Download SDK zip from the latest COSMOS build, and unzip on top of the Eclipse install.