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Upgrading .unitypackage files is a little more difficult. This quote from the Unity docs explains it:
"For the cleanest possible upgrade, it should be considered to remove the old package contents first, as some scripts, effects or prefabs might have become deprecated or unneeded and Unity packages don't have a way of deleting (unneeded) files (but make sure to have a security copy of the old version available)."
The easiest way I've found is to use the approach the SVN docs recommend for vendor branch upgrades.
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A new scene entitled "mecanim" has been added to the vhAssets package which displays 2 of the Brad character, one driven by the Smartbody animation system and the other by Unity's Mecanim animation system. This scene is currently in development but can be used as a guide for how to setup a mecanim character. For information on Mecanim, please visit Unity's documentation http://docs.unity3d.com/Manual/AnimationOverview.html. This scene needs to be loaded through the MainMenu scene to work properly. Alternatively, you can manually activate the SmartbodyManager, VHMsgManager, and DebugConsole objects.
Setup
Select a gameobject and add the MecanimCharacter component to it. By adding this one component, other components required to make the character nod, blink, gaze, etc will automatically be added. Make sure there is a gameobject with the MecanimManager component in the scene as well.
For an example of how to setup a mecanim driven character, click on the gameobject ChrBradPrefab_Mecanim in the mecanim scene. 
Also add a child game object called "SoundNode" and attach an audio source to it. Again, see ChrBradPrefab_Mecanim as a reference.
Testing
Use the UI menu on the left side of the screen to test animations, nods, gazes, saccades, and lip sync.
Mecanim Help
For information on Mecanim, please visit Unity's documentation http://docs.unity3d.com/Manual/AnimationOverview.html
DebugConsole
Add a new command callback for an arbitrary command
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