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Disconnect your Mac from the internet. Open Terminal from the Utilities menu in the macOS Installer screen. Type date 0101010118 (which resets the system clock to January 1, 2018) and press Enter . Quit Terminal and attempt the installation again. "An error occurred while preparing the installation"

Some users have reported that updating to 10.12.6 made their systems slightly slower or caused occasional freezes. work download macos sierra 1012 6

Download the "macOS Sierra.app" from the Mac App Store. Connect USB: Plug in your USB drive and name it Untitled . Disconnect your Mac from the internet

macOS Sierra 10.12.6 can be installed on compatible Mac models using direct, legacy download links from Apple, requiring at least 2 GB of RAM and 8.8 GB of storage. The installation process involves downloading a InstallOS.dmg file, running the InstallOS.pkg to extract the installer, and using the Applications folder to initiate the upgrade. For direct links and full instructions, visit Apple Support . macOS Sierra (10.12.6) Download - Apple Support Community Quit Terminal and attempt the installation again