i mac will not allow upgrade to latest version of os, gives no reason
i mac will not allow upgrade of latest version of os, gives no reason
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Is it a 2015 or later model (from Apple menu > About This Mac)? See compatibility section of How to upgrade to macOS Monterey - Apple Support
Doe it have enough free space? See the following from the same support article:
If upgrading from macOS Sierra or later, your Mac needs 26GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44GB of available storage.