Thank you for your interest in our UI for WPF controls.
The mentioned nugget package still present in the latest version of our assemblies. Now we have one package for 40 and 45 .Net version. You can add a reference to the following DLL with a name: Telerik.Windows.Controls.DataVisualization.for.Wpf.Xaml.2020.1.218 (or different version)
Give this approach a try and let me know if further assistance is required.
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