While not strictly "portable," Microsoft once provided free, time-bombed Windows VMs (IE6, IE7, IE8, IE9, IE10, IE11) for cross-browser testing. These VMs run in VirtualBox or VMware Player. They are because they provide the complete, authentic environment. Search: "Microsoft Edge Developer VMs for IE testing" (note: Microsoft discontinued them, but Archive.org hosts mirrors).
if the site you are visiting is not HTTPS-enabled. internet explorer portable old version