Unity 4.5.1 - url: https://kharma.unity3d.com/

New Assets purchased. Cannot download or use them. Unity Editor, Asset Store will not load content. (blank tab)
Win7 x64 / Unity 4.5.1 - url: https://kharma.unity3d.com/

Project Settings> Player TURN OFF dx11
This worked for me. Will someone explain why.

Unity 4.5.4 it does not work, and I’m also getting an error: Unable to find type [UnityEngine.dll]UnityEngine.ResourceRequest

Wondering if the two are not related. Any other ideas?