I am glad that you are interested in the Telerik RadControls for Silverlight.
What the Create/Convert/Configure Wizard does is to add reference to the assemblies that you have selected. After creating/converting a project you can still add more references using the Configure Wizard or manually through the 'Add Reference' dialog. Here is an article with more details about the project management wizards - http://www.telerik.com/help/silverlight/radcontrols-for-silverlight-vs-extensions-project-configuration.html
. When you don't know which assemblies you need you can simply drag a Telerik RadControl from the Toolbox and the Visual Studio will add all the required assemblies.
All RadControls that are available for SL4 are also available for SL5. With that in mind I don't think that you have reason to use SL4 controls in a SL5 project. Moreover we strongly encourage you to use RadControls that target the same SL runtime as your project.
The recommended way to apply a hotfix is using the Get Latest Version utility - http://www.telerik.com/help/silverlight/radcontrols-vs-extensions-project-latest-version-acquirer.html
. The procedure that you have followed can cause unusual side effects thus we don't encourage you to follow that upgrade path. You should install latest version either using the msi installer or using the Get Latest Version utility. This way you will be able to use the latest version in our wizards and in the Toolbox.
I hope the information provided helps. If you have any further questions please write us again.
the Telerik team
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