upgrade ios for mac book pro early 2011
how to upgrade ios from high sierra on an macbook pro early 2011
MacBook Pro 13″, macOS 10.13
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High Sierra is the highest version possible on an early 2011 MacBoo Pro. See the following from Identify your MacBook Pro model - Apple Support
MacBook Pro (13-inch, Early 2011)
Model Identifier: MacBookPro8,1
Part Numbers: MC724xx/A, MC700xx/A
Newest compatible operating system: macOS High Sierra 10.13.6
Also note that iOS is the operating system for iPhones and macOS is for Macs.