If you want to install Oracle SQL Developer on your Windows computer for free, check if you meet the requirements and then go through the instructions mentioned here.

Warnings Information in this article applies to Microsoft SQL Server 2012. The instructions for earlier versions of SQL Server, including versions 2008 and 2005, are similar.

I have been struggling with getting SQL Server 2012 SP2 Express installed. It gets through the installer but fails at the end with the following error.