macOs for McBook pro mid 2012

Back up your data, check your applications for compatibility, and click on Mojave or Catalina.

Catalina and newer won't run 32-bit software; download and use Go64 to scan for it. To check other programs, click here and look them up.

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A mid 2012 MacBook Pro can be upgraded to Catalina 10.15.7 but no later. See: https://support.apple.com/en-us/HT211683