![]() This lack of preflighting can cause a stock installer downloaded from Apple to repeatedly throw the dreaded error message in your post’s title, "An error occurred while preparing the installation. ![]() Even though Apple claims on their website that High Sierra supports my late 2009 iMac 10,1, and HS runs natively on my Mac, the High Sierra installer mistakenly considers my hardware to be no longer supported. By studying the file, I learned that Apple does not preflight the High Sierra installer’s setup on unsupported Macs. ![]() Here’s the trick: Qne doesn’t necessarily need to apply the patches on this page for unsupported Macs when using this installer, and a few minutes downloading the High Sierra installer through this app will potentially save hours or even days of frustrating and unnecessary effort. ![]()
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