The latest update is too old for some assets?

If you take a look at this asset below, you’ll see Unity 4.6.0 is a must:

If you take a look at the latest downloadable version of Unity, you’ll see it’s Unity 4.5.4! D:
http://unity3d.com/unity/download

How is that possible? How can I upgrade to 4.6.0 if it hasn’t been released yet? Or perhaps it has? Perhaps I’ve misunderstood something? How can I get that asset and start to learn the tutorial :´(

4.6 Beta is released at the moment. If the asset requires 4.6 you’ll need the Beta to use it.

Your google must be broken. When I type “unity 4.6 beta download” into Google and hit search, the mystery is solved.

(If your google really is broken try here.)