Thank you for contacting us.
The easiest way to have our extensions in a Visual Studio 2010 is to get them from the Visual Studio extensions gallery. Follow the steps below:
1. Open Visual Studio 2010.
2. Open the Extension Manager dialog (Tools | Extension Manager...).
3. Click on Online Gallery and type "telerik" in the Search Online Gallery field.
4. Find Telerik WPF VSExtensions from the search result, download and install it.
5. Restart you Visual Studio after the installation (you will be prompted).
You can also use our Control Panel to install and manage our products (Link)
Please do not hesitate to contact us again for further assistance.
the Telerik team