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This message is expected if your project refers Telerik
assemblies from GAC. I would suggest to use the Upgrade wizard
under your Telerik
menu in order to switch (upgrade) your references to assemblies from installation/download folder. You could upgrade to the same version assemblies and the Upgrade wizard
will automatically set your references. Detailed information regarding the Upgrade wizard
is available here: LINK
Once your project is updated try to add RadForm
Please let us know if any questions arise.
Telerik by Progress
Check out the Windows Forms project converter, which aids the conversion process from standard Windows Forms applications written in C# or VB to Telerik UI for WinForms.For more information check out this blog post
and share your thoughts.