The problem is related to .NET 4.0 and VisualStudio. Instead of installing .NET 4.5, you can disable VisualStudio hosting process (check attachment) and it will work fine. Nevertheless I tested a simple RadPivotGrid
project created for .NET 4.0 on a machine with .NET 4.5 installed, on Windows XP SP3 (only Silverlight and .NET 4.0 are installed on it). RadPivotGrid
is working fine. So the problem is related to the debug process of VisualStudio and there's no need for your customers to have .NET 4.5.
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Hopefully this clears it out.
the Telerik team