Telerik License Not Found Dialog Shown in the Main Project When Telerik UI for WPF is Installed in a Class Library

Updated on Sep 24, 2025

Environment

Product Version	2025.2.521
Product	UI for WPF

Description

The invalid or missing Telerik license key dialog and watermark are displayed when the Telerik assmeblies are referenced, even when a valid license is installed. This happens when Telerik UI for WPF is installed in a class library that is referenced in the main project, where the main project doesn't explicitly reference the Telerik assemblies.

This behavior occurs in .NET projects and .NET Framework projects using the SDK-Style template.

Solution

This is an expected behavior that comes from the nature of the Telerik licensing mechanism. To resolve it, use one of the following two approaches:

• (recommended) Make sure to install the Telerik.Licensing NuGet package also in the main project.

  XML

  	<!-- this is in the main project's .csproj file -->
  	<ItemGroup>
  		<PackageReference Include="Telerik.Licensing" Version="1.6.*" />
  	</ItemGroup>

• Or alternatively, add the IncludeAssets and PrivateAssets attributes to the PackageReference tag in the .csproj file of the class library.

  XML

  	<!-- this is in the class library project's .csproj file -->
  	<ItemGroup>
  		<PackageReference Include="Telerik.Windows.Controls.for.Wpf.Xaml" IncludeAssets="all" PrivateAssets="none" Version="2025.2.521" />
  	</ItemGroup>