Macbook Pro Upgrade Options
Can I upgrade my old Macbook Pro to a newer version without purchasing a new Laptop?
MacBook Pro 15″, OS X 10.11
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It depends on the model year of your MacBook Pro.
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: How to get old versions of macOS - Apple Support
A mid 2010 through late 2011 MacBook Pro can be upgraded to High Sierra 10.13.6 but no later version. See: How to get old versions of macOS - Apple Support
A mid 2012 through early 2013 MacBook Pro can be upgraded to Catalina 10.15.7 but no later. See: How to get old versions of macOS - Apple Support
A late 2013 and mid 2014 can be upgraded to the latest version of Big Sur macOS 11 but no later. See: How to get old versions of macOS - Apple Support
An early 2015 or later can be upgraded to the current version of Monterey macOS 12. See: How to upgrade to macOS Monterey - Apple Support