I have been having some problems with the installation package for Mac OS. A few user reported that the installation would create an empty folder named NextGenGalleryExport.lrplugin, when in fact there should be over 60 files inside. I implemented a workaround in the latest version of the Mac OS installer. If you downloaded the package before Sep 19, 2012 3:00 PM (EDT) and can't get the plugin to work, please re-download and try installing again. If you are still having trouble - e-mail me at alloyphoto@alloyphoto.com and I'll send you a zip file with the plugin's content.