SQL Express and the missing config file

When you install Microsoft SQL Server the install generates a configuration file. This is great if you want to create an unattended install of SQL. If you want to do a second install (or third or fourth…) just run: 

Setup.exe /ConfigurationFile=ConfigurationFile.INI

and you get the same install again.

Today I wanted to do the same with SQL express… but no file was created… Hmmm…

Apparently you need to start the install using this:





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