On my server, I have SQL Server 2008 R2 Developer Edition installed, and setup don’t want to upgrade it to SQL Server 2012 Express.
Does SQL Server 2012 Developer Edition exist?
It exists at least on the MSDN download site. Also, according to the SQL Server 2012 Licensing FAQ, “Developer, Express and Compact Editions will also continue to be distributed without licensing or pricing changes”.
Source : Link , Question Author : abatishchev , Answer Author : Sergey Vlasov