SQL Server 2012 Express (x64) cannot upgrade the existing instance of SQL Server Express (x64 WoW) named 'SQLEXPRESS'

Question

Microsoft SQL Server 2005 Express edition is already installed. I added SQL Server 2012 Express in Prerequisite in Windows Installer.

I'm getting this error while installing setup at start

Can not install different instance. Required instance name as SQLEXPRESS.

Prerequisite check for system component SQL Server 2012 Express failed with the following error message:
"SQL Server 2012 Express (x64) cannot upgrade the existing instance of SQL Server Express (x64 WoW) named 'SQLEXPRESS'.
Uninstall this instance of SQL Server Express and retry installing SQL Server 2012 Express (x64)."

Thanks

Answer 1

You try to give the name SQLEXPRESS to your second instance while there is already one (2005) instance on this pc with the same instance name.

What you need is just to give another name to the second instanse, for example SQLEXPRESS_2012, when install it