Unibeast 7.0.1 USB drive repeatedly fails to copy Base System. Moved the "Mac OS Install Data" folder from the root drive to "Applications," but same error. Should the "ESD.dmg" image be opened manually?
Tried the "direct update" (first) which did not work either: There was no "Boot Mac OS Install" option present, only my two "El Capitan" disks and the "Recovery HDs." Tried that several times.