Type date 0101100017 (This sets the clock to January 1, 2017) and press Enter. Quit Terminal and attempt the installation again. Error: "An error occurred while preparing the installation"
Copy and paste the following official Apple command into the Terminal window: download macos sierra 1012 dmg file install
Running macOS Sierra online is a security risk. Do not use it for banking, email, or daily browsing. Use only for offline projects, retro computing, or air-gapped legacy hardware. Type date 0101100017 (This sets the clock to
Select your internal hard drive (usually named Macintosh HD ) from the left column. Click . download macos sierra 1012 dmg file install
Without these updates, Sierra will have the "Hole in the Boot" security vulnerability (CVE-2017-13890).
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