This software repository,
http://download.eclipse.org/releases/indigo/, provides access
to the software for the Eclipse indigo
release. It contains code from the release, June 2011, and SR1, September 2011 and
SR2, February 2012.
The repository site URL is typically pre-populated in the list of software repositories when you install the Eclipse Platform or SDK.
For more information about installing or updating software, see the Eclipse Platform Help.
There is also a collection of handy, downloadable all-in-one zip files available for many interests and platforms. Many people find these all-in-one packages the easiest way to get started.