Additionally the certificates may make a download appear not available.
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. 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. If it is not running 10.12 yet, but was prebundled with 10.11, it can be upgraded to 10.12 first, then upgraded to Catalina. If a Mac shipped new with 10.11 it can be updated to 10.14 Mojave direct from the Mac App Store.
macOS Catalina is compatible with these computersĮl Capitan System (10.11) requirements for upgrade.El Capitan System (10.11) requirements for upgrade.
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