Why won't my extension work?

Downloaded the admob extension in a winrar .zip, click install through the extensions tab in settings. Doesn't seem to do anything. Am I missing something here? I have the latest version of Stencyl (downloaded yesterday).

Did you enable it? Did you restart your game? Did you restart stencyl? Did you look in the custom block tab?

Thanks, solution found. I manually copied the extension to stencyl's plaf file.