Mac OS Update Error - The Recovery Server Could Not Be Contacted I am not able to update my Mac OS from Sierra to HIGH Sierra. It shows the error below when I try to update from iTunes. How to fix it?
Finally following steps worked for me,


From System preference -> Date &amp; Time, enable set time zone automatically using current location option
Share location for the time being if asked





Press CMD + Space to open Spotlight search, write 'Terminal' and hit
return. It will open Terminal window
Enter the following command in Terminal window



  
    
      sudo ntpdate -u time.apple.com