Question: Upgrade to High-Sierra failed
I am running iMac with Sierra installed. To upgrade to High-Sierra I used Net-Update (recommended in a email from Apple). After downloading the complete Sierra, an error occured and there was no way to boot anymore.
Now, using the Option Key I get the chance to select the 'OS X Base System' which tells me that:
"mac OS could not be installed on your computer, the path /System/Installation/Packages/OSinstall.mpkg appears to be missing or damaged"
--> this "OS X Base System (image) of High Sierra cannot get unmounted.
** I tried to get a bootable OS X stick from Apple, to solve the problem. Unfortunately they dont have this.
** I have a complete Backup, however, without a running OS X its of no use.
Hope for help. Thank you very much.
Mission Control-OTHER, Mac OS X (10.7)