The Upgrade Wizard for WPF cannot upgrade projects targeting the 4.8 .NET Framework.
1. Install the latest extension for WPF
2. Create a new project targeting the 4.8 .NET Framework
3. Try to launch the Upgrade Wizard from the Telerik menu
4. See the error - The project cannot be upgraded because the target framework does not match
In the WPF Create New Project Wizard, the target framework versions dropdown is empty when no distribution is installed: