the same goes to mac bootcamp that supports win 7 only... i tried digging around to make my oversized homebrew win7 with latest updates iso to reduce at an acceptable size to at leaset it could barely burn onto regular DVD. i once did homebrew because all setup in the latest windows 7s available in torrents to date has always got setup wizard that derived from either win 8 or win 10 and and it bothers me big time so i decided to homebrew a win7 iso with latest updates just to put it to work with bootcamp to cut the story short i ended up with huge iso not fitting on regular DVD since win7-only macs dont support bootcamp via USB media. so i started digging tonight over google searches i ended up finding this thread https://forums.mydigitallife.net/threads/install-esd-windows-7.68315/ that had led me to hit this very thread.