This version of the Oculus Sample Framework for Unity 5 pulls in the most recent Avatar SDK and Utilities for Unity versions. Importing the Avatar SDK and Utilities for Unity 5 separately is not required. It is compatible with Unity 5.4 and up - please check Compatibility and Version Requirements for up-to-date Unity version recommendations.
For complete instructions on downloading and using the Sample Framework, see Unity Sample Framework in our developer documentation.
We now offer the Unity Sample Framework through the Unity Asset Store here in addition to our Downloads page. The Oculus Integration, also available from the Asset Store here, provides several unityPackages in a single download, including our Utilities for Unity, Oculus Platform SDK Unity plugin, Oculus Avatar SDK Unity Plugin, and Oculus Native Spatializer Plugin.