PDE templates are in the plugin org.eclipse.pde.ui.templates. I use standard Eclipse packaging, and this plugin is part of the "distribution". Perhaps you can look at the Helios software repository (Help β Install new software β Helios Repository) and see if you can find any features related to the PDE user interface template.
EDIT: After checking, the PDE template plugin is part of the PDE function. As a result, if you have PDE installed, you must have templates. What "distribution" of Eclipse did you download from the download page?
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