Crea la cartella
%SystemDrive%\ProgramData\Microsoft\SQL Server Management Studio\12.0\Addins\
se non esiste. Quindi copia il file da:
%SystemDrive%\ProgramData\Microsoft\SQL Server Management Studio\11.0\Addins\PoorMansTSqlFormatterSSMSAddIn.AddIn
a
%SystemDrive%\ProgramData\Microsoft\SQL Server Management Studio\12.0\Addins\PoorMansTSqlFormatterSSMSAddIn.AddIn