1) Can AnyToISO extract mac high sierra install/update DMGs + PKGs ?
No sign up or dev account needed to download the newer mac system DMGs directly from apple.
http://appldnld.apple.com/macos/091-58875--20180109-7052760C-F266-11E7-8A10-F41F3B84D6FD/macOSUpd10.13.2Supplemental.dmg