Error installing the new MacOS

try to install macOS Sierra and I get this message "the responsibility of the installer has no signature verification"... what this means?  my Macbook pro is mid-2012

Have you tried to reset the date and time?

  1. Click on the Apple menu
  2. Click System prefrences
  3. Click date & time
  4. Uncheck the box set a date and time automatically
  5. Check setting the date and time automatically

Try to run the installer again and see if you get the same error message.

If you still have questions, have you tried to remove and re - download macOS Sierra

  1. Make sure your computer is connected to the power supply
  2. Drag the Sierra of your trash macOS
  3. empty the trash
  4. Open the app store
  5. Select Sierra
  6. Click Download

Tags: Mac OS & System Software

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