The Unisys Composite Application (CA) Development feature is downloadable as one of the files you obtained earlier. The UnisysCompositeAppDevelopment.zip file should already be in the C:\Eclipse2200Temp folder. If not, see Before You Begin.
Unzip (extract) the UnisysCompositeAppDevelopment.zip file using the C:\eclipse folder as the target location. Be sure to check All files and Use folder names. This extraction adds the Unisys CA feature to Eclipse.