Hello all, first post here.
I am attempting to update student devices from sierra to high sierra (I know we're a bit behind the Mojave update, we're just not ready to make the jump yet). I am accomplishing this process by caching an installer by policy when they are in range of our distribution point and providing a button in Self Service to allow them to install from home.
I have the policy for the button set to install the cached file and it works. On most devices.
I have a hand-full of units that show a message "Unable to Unarchive Installer." I've done a search and it pointed me at a combo update that seemed to be more for updating devices already on High Sierra, I tried it anyway to no avail.
Any idea what to do about this? I'm having to manually contact the students and call them in to force the install.