I have a mac book my tax software needs 15.1 why cant I update
I have a mac book my tax software needs 15.1 why cant I update
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The current macOS is version 12.2.1. There isn't a 15.1 macOS.
Are you maybe asking about a Safari version or an iPadOS version?
Also, for macOS versions on a MacBook Pro, see below. If your Mac cannot be upgraded, another option is to use online tax software such as TurboTax online. They can be used with older Macs.
The model year of a MacBook Pro is available at Apple menu > About This Mac.
An Early 2008 through mid 2009 MacBook Pro can be upgraded to El Capitan 10.11.6 but no later version. See: https://support.apple.com/en-us/HT211683
A mid 2010 through late 2011 MacBook Pro can be upgraded to High Sierra 10.13.6 but no later version. See: https://support.apple.com/en-us/HT211683
A mid 2012 through early 2013 MacBook Pro can be upgraded to Catalina 10.15.7 but no later. See: https://support.apple.com/en-us/HT211683
A late 2013 and mid 2014 can be upgraded to the latest version of Big Sur macOS 11 but no later. See: https://support.apple.com/en-us/HT211683
An early 2015 or later can be upgraded to the current version of Monterey macOS 12. See: https://support.apple.com/en-us/HT212735