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I have a Mid 2011 iMac and i'm trying to update from macOS Sierra Version 10.12.6 to HIGH SIERRA. However, I keep getting this error when I install and it attempts to restart my computer "An error occurred while preparing the installation. Try running this application again."
Can you help me figure this out?
iMac Line (2012 and Later)
Start with this...
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.
Do you get the problem in Safe Mode?
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.
Start with this...
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.
Do you get the problem in Safe Mode?
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.
Is there already another Copy of the Full Installer for High Sierra existing in the Applications folder or in the Downloads folder on the dock.
If so, remove it and download a New Copy
macOS Sierra update to macOS High Sierra issue
