why can't i update my macBook Pro to the latest version
why can't i update my macBook Pro to the latest version
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You didn't post what year your MacBook Pro is and what version you are trying to update to, so this may or may not be helpful:
The model year of a MacBook Pro is available at Apple menu > About This Mac.
A mid-2010 through late-2011 MacBook Pro can be upgraded to High Sierra 10.13.6 but no later version.
A mid-2012 through early-2013 MacBook Pro can be upgraded to Catalina 10.15.7. See: How to get old versions of macOS - Apple Support
A late-2013 or later can be upgraded to the current version of Big Sur. See: How to upgrade to macOS Big Sur - Apple Support