To download macOS Sierra 10.12, follow these steps:
Q: Can I upgrade to Mac OS Sierra 10.12 from an older version of macOS? A: Yes, you can upgrade to Mac OS Sierra 10.12 from an older version of macOS, but make sure your Mac meets the system requirements. mac os sierra 1012dmg download free
Disconnect your Mac from the internet. Open Terminal from the recovery screen utilities menu and change your system clock to a date close to the software's release. Type date 0101100017 (January 1, 2017) and press Enter. Quit Terminal and restart the installation. "Damaged installer" or "Payload verification failed" To download macOS Sierra 10
Apple's servers may throttle downloads for legacy software. Try downloading during off-peak hours or using a download manager. Open Terminal from the recovery screen utilities menu
This occurs when trying to run the Sierra installer on an unsupported Mac or on hardware that's too new. If you're using a Mac that originally came with a newer operating system, you'll need to use an older Mac for the download process.