Currently the SDK is only capable of checking whether Silverlight 4.0 is installed. This is why the warning pops up and prevents you from going forward. There are a few things you can do though in order to explore the example. The easiest one would be to configure the Overview.xml file located in <Program-Files>\Telerik\OpenAccess ORM\ProductSdk\Content\Samples\Silverlight\CSharp\N-Tier example.
Just open it in your editor of choice, locate the Requirements node, and remove the node for Silverlight 4.0, this will ensure that the SDK browser does not hold you back.
I hope this helps. We will be fixing this in the upcoming SDK release.
the Telerik team
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