Error installing the new MacOS
trying to install macOS Sierra and i get this message "The installer payload failed signature check"....what does this mean? my Macbook pro is mid 2012
MacBook Pro (13-inch Mid 2012)
Have you tried resetting date & time?
- click on the apple menu
- click on system prefrences
- click on date & time
- uncheck set date and time automatically
- check set date and time automatically
Try running the installer again, and see if you get the same error message.
If your still having issues, have you tried deleting and re-downloading macOS Sierra
- make sure your computer is plugged into power
- drag macOS Sierra to your trash can
- empty the trash
- open the app store
- select Sierra
- click download