Little confused. Whats the difference between MPI Installer and MPEI extensions installer? For instance I download OnlineVideos from the pluggins page. Go to install it. Tells me that I need to use the MPI Installer. If that is an application, I don't know where to find it. I thought it might be referring to the MPEI installer, but that doesn't have OnlineVideos in it or a couple of the other plugins i'm trying to install. Little guidance? Thank you.