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How do I locate the crash logs file?

To locate the crash logs.

From Lion 10.7.x to Sierra 10.12.x, from the desktop press the Option key and select Go > Library.

Navigate to:
Library > Logs > Diagnostic reports > there will be one or more files that look similar to this -->  Phocus_2017-11-21 105653_MacBook-Pro.

These files are advantageous for technical support to review should you encounter a problem.