Thank you for sharing the package manager message.
This states that the projects are using a version of Xamarin.Forms that is a little too old, 22.214.171.1247273
. If you update all your projects to Xamarin.Forms 126.96.36.1997729
, you will then be able to install the latest release of the Telerik UI for Xamarin (2018.3.921)
Lance | Tech Support Engineer, Sr.
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