It’s likely a Windows permissions problem. As long as you have the latest SU version, go to the Properties Window, click on “Install Extension” and load the ZIP file from there. If you run into trouble, first rename the ZIP file so that it has an RBZ file extension.
who whined? not me. However, you did about my comment. An interview this awesome all you can do is whine about other peoples meaningless comments? I actually loved the interview in case you were wondering