macOSUpdCombo10.14.6.dmg from the official apple site twice now in order to update my 10.10 to 10.14, both times when I try to open the dmg I am told that it can't be opened as the image is corrupt.
I'm at a loss, this isn't happening with other dmg files I have, I've run the
disk utility function
verify on my drive and it reports no errors.
Is it the file? Am I doing something wrong? Any insights would be appreciated.