![]() Two factor authentication needed to unlock AppleID was initiated with 10.12.4. Note, some downloads from Apple do not work in Safari for earlier Mac OSes, see this tip if you find you can't download them anymore, to find a browser that will work.Īll Macs prebundled with 10.12 can be upgraded to Catalina directly. Download based on manual time may fail, especially on older systems where the system time is not set right. ![]() Go to Apple menu -> System Preferences -> Date and Time and select the closest time server to set your time, and do so. ![]() This tip is part of a series of tips for : Mac OS X 10.6, 10.7, 10.8, 10.9, 10.10, El Capitan System (10.11), Mac OS 10.12 Sierra, 10.13 High Sierra, 10.14 Mojave, and 10.15 Catalina, and 11.0 Big Sur.ġ0.12 is not to be confused for 12.0, the upcoming operating system of fall 2021. Links to this page may give the author compensation. ![]() This page will be updated on the author's own homepage:
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