The addon at RyanVM site, if you look closely integrates into the windows installation files, ie, replaces older files with new ones. But the inside the cab addon posted here, there is an full single file installer which blasts off while windows is installing and that is the reason it acts more like another program getting installed into windows. For me this leaves with windows update again getting selected though I have nlited it. Secondly, IEPro is an addon, much like others like Avant Browser. These use the Internet explorer's engine to give you a web browser with few more added functionalities.