Installation SQL Server 2016 error I just uninstall SQL Server 2012 (but Microsoft SQL Server 2012 didn't uninstall completely), now I want to install SQL Server 2016 but it causes this error:


  vs shell installation has failed with exit code 1638.


I google it but can't find a true answer.
Exit code 1638 is Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel