Can't Load GH in Rhino 5 WIP 32-bit

The newest version of Grasshopper has been successfully loaded in Rhino 4, but it failed in Rhino 5...

I've  copied the grahopper file to C:\Program Files\Rhinoceros 5.0 WIP\Plug-ins and launched the PluginManager installing the GrasshopperPlugin.

But it didn't work...

Hopefully some could help  with the problem.

Thanks!