Telerik UI for Xamarin steps on top of the Xamarin Platform. Xamarin Platform provides two options for developing with the Xamarin technology - Xamarin Studio and Xamarin plugin for Visual Studio. You can download both only from xamarin.com
, but note that as per the Xamarin pricing, you can work with the Visual Studio extension after you install it only if you hold a Xamarin Business license
. Whichever your license is, you will be able to install Telerik UI for Xamarin after you download and install the necessary Xamarin Platform environment.
Let me know if you have additional questions.