I have tried to upgrade to High Sierra, but every time I get an error code. My IMac will not really work very well with Sierra. I need a newer operating system. Am I stuck and left with no option but a new computer? Any help appreciated. I am not very tech except with the basics. Thank you for any help available.
iMac 21.5″, macOS 10.12
Start up from macOS Recovery
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
In Disk Utility>View, select Show all Devices, highlight the top left entry.
APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.
What has often worked for others is to use this Restore Method instead of CMD+r keys...
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
Messed up Factory Reset on MacBook Pro Mi… - Apple Community
2017 iMac failing to install Sierra in re… - Apple Community
Clean Install of High Sierra: Multiple Fa… - Apple Community
An Error Occurred While Preparing The Ins… - Apple Community
What is the error code?
see > Take a screenshot on your Mac - Apple Support
What year model is the iMac?
That is a Mid 2011 21.5" iMac, correct?
Try starting up in Safe Mode using the directions at > Use safe mode on your Mac - Apple Support
Go to Apple > System Preferences > Software Update and see if High Sierra shows up.
If it does, select High Sierra and follow the onscreen install instructions.
If not, restart and follow the App Store directions at > How to download and install macOS - Apple Support
I Mac 12,1
Error code An error occurred during installation try again
Yes. I downloaded the High Sierra install but it will not finish installing. I will try the safe mode
Still get the error occurred while preparing the installation. Try running the application again! Ugh!
upgrading an old iMac IOS Sierra to High Sierra
