Thank you for responding to my question.
However, I still cannot install it into lightroom. When I followed you directions I could not find the file (only folders showed up in the window). I eventually ended up deleting that file from my computer because I had opened it up in the extension manager and could not do anything with it. I cannot figure out how to redownload the smugmug file since all I get when I open my Add On page is either to install or remove. Nothing happens with either option.
David Pennock