Cannot complete the install because of a conflicting dependency.
Software being installed: Android Hierarchy Viewer 23.0.2.1259578
(com.android.ide.eclipse.hierarchyviewer.feature.feature.group 23.0.2.1259578)
I have read all the previous answers bt didnt help !
I had that as well, but I didn't want to reinstall my Eclipse. So I uninstalled the ADT bundle plugins (from Eclipse->About Eclipse-> Installation Details -> Android DDMS (and others) -> [Uninstall]), then restart the eclipse.
After that, install the ADT plugin again.
This worked without any issues.