How can I up-date OS 10.13.6 to OS 10.15 or higher?

Back up your data, check your applications for compatibility, and depending on which Mac model you have, click on Catalina, Big Sur, or Monterey. It needs to be at least a 2012 one(2013 for desktop Mac Pros) to be capable of any of them.

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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