Talk:MacBook Pro/@comment-36532637-20180810093300/@comment-31714002-20200420215008

If you're on 10.6 Snow Leopard, you have to upgrade to OS X 10.11 El Capitan first. Support for 10.13 includes many 2009 and 2010 models, but note that it may break compatibility with some older 32-bit apps. If you have a more recent model that supports 10.14 or 10.15, Apple's installer may force you to go newer for security purposes. https://www.macworld.com/article/3199825/macos-high-sierra-features-specs-pricing-faq.html