Use RadCaptcha in sharepoint 2013

Thanks Slav for your help, 

I Want to clarify a few things:

1. The RadCaptcha is initially visible, but when I click the link the image is not updated.
2.   I removed the  RadScriptManager and keep the  asp:ScriptManager that in the sharepoint master.
3.   I receive no error in the console tab, but I receive 200 response from ScriptResource.axd and not from Telerik.Web.UI.WebResource.axd. I also receive no image in the response but the following response that don't
look like a partial response with Html an javascript...