Laptop macOS update failing
4.5
The macOS installer fails with "An error occurred while preparing the installation".
Symptoms
- Installation failed
- Stuck on Apple logo
- Recovery mode loop
Possible Causes
- Date/Time mismatch
- Low disk space
- Corrupt installer download
Step-by-Step Fix
1
Check System Clock
In Terminal, type "date" and ensure it matches the current time.
2
Free Up 30GB+ Space
macOS updates need significant room to expand.
3
Download from App Store
Try downloading the full installer instead of using Software Update.
When to See a Technician
If it fails on an Intel Mac, try resetting the NVRAM and SMC before updating.
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