Hello Salie, Gio,
I see that you have found the right resources, but just to clarify the situation:
The installer installs a Silverlight 5 version of the controls. If your project targets Silverlight 4, you can download a hotfix (zip with the dlls) from your account. This can be done after you log in to your account and follow these steps:
1. Go to Your Account;
2. Select "Download and manage your products";
3. In the RadControls for Silverlight section select "Download";
4. Find the hyperlink "Silverlight 4 - DLLs only (zip, 20 MB)".
Kind regards,
Kammen
the Telerik team
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