Code Recommenders supports Eclipse 4.2-4.4. Eclipse 3.x versions are not supported anymore.
There are three different update sites:
Stable: 1.0.x series
Official releases of the project. Stable features, no experiments.
Milestones: pre-2.0.0 series
Milestone builds towards Recommenders 2.0. Latest and greatest features but can be unstable at times.
Head: pre-2.0.0 series
Head builds. Bleeding edge features, directly published from Hudson. For committers and real fans!
Unmaintained Eclipse 3.x builds
Note that these update sites are not updated anymore and will disappear without prior notice.