On the webpage of eclipse (www.eclipse.org), click on DOWNLOADS. Download the package "Eclipse for RCP/Plug-in Developers".
Tip
You might have to click on "More Packages" to see the RCP download package.
Tip
Don’t extract Eclipse into a directory tree that contains special characters. I also recommend to avoid spaces in the directory name.In case you have downloaded the Eclipse Java IDE (or any other non RCP flavor) distribution you can use the Eclipse Update Manager to install the plugins required for RCP development. See Eclipse Update Manager for details on using the update manager.
Install "General Purpose Tools" -> "Eclipse Plug-in Development Environment" and "Eclipse RCP Plug-in Developer Resources" from the Galileo update site.
