Then I had to use Safari to download Sierra dmg from here: Https://support.apple.com/en-us/102662. Source: over 1 year ago
Shot in the dark, https://support.apple.com/en-us/102662. Source: over 1 year ago
Just reset your computer and install the latest system you can. After you can download macOS 12 and run the upgrade. Here’s a page that has links to most versions of macOS: https://support.apple.com/en-us/102662. Source: over 1 year ago
You can download old versions of macOS from the How to download and install macOS page on Apple's Support website. Source: over 1 year ago
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