Hello,     

We haven't had similar reports from other customers. The WinForms Converter tool allows you to convert the standard .NET Windows Forms controls for all projects in a particular solution to their equivalent in Telerik UI for for WinForms. Before starting, you need to open a solution which contains a project that is using standard Microsoft Winforms controls. This will enable the converter option in the UI for WinForms menu item.
However, please ensure that you meet the requirements in order to be able to use the controls converter:
- Visual Studio 2015 Update 2
- .NET 4.6.1 - this is required if your Visual Studio does not have Update 2 installed.
- Solution that contains project with default .NET controls.

Then, you can follow the step-by-step tutorial: https://docs.telerik.com/devtools/winforms/winforms-converter/step-by-step-tutorial

If you are still experiencing any further issues, it would be greatly appreciated it you can provide some screenshots illustrating how the Telerik menu in Visual Studio looks on your end.

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Happy holidays 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik