Let me start with some explanation. The upgrade wizard lists all different versions of RadControls for Silverlight that are on your machine except
the one that is used in your current project. The wizard searches in the following two locations:
- C:\Program Files[ (x86)]\Telerik\RadControls for Silverlight*;
Having the above information in mind can you double check in the above locations that you have available version, different than the one that you currently use?
If you have different versions that you can upgrade to, but they are not displayed then you can try to reinstall the RadControls for Silverlight.
If this doesn't help too, then I will ask you to open a formal support ticket and send us the project that reproduces the problem. Then we will be able to further research the problem.
the Telerik team