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We've updated the Windows Platform Installer (WPI) feeds for the Visual Studio LightSwitch server runtime components. Previously there was only a single option that would install the server runtime components along with SQL Server Express which we considered to be the primary deployment scenario for LightSwitch applications. We've received feedback to make this optional for scenarios where a full version of SQL Server is installed or the database may be hosted on a different tier. In the latest WPI feed you will now see two options for the LightSwitch server runtime, one that includes SQL Express (which is the same as the previous option) and one that does not include SQL Express.
So... for scenarios where SQL may already be installed or hosted on another computer, choose the option that does not include Local SQL support. See the LightSwitch deployment guide for complete instructions on publishing LightSwitch applications.
For those who also could not find these runtime components: unlike what is said here: msdn.microsoft.com/.../gg481779.aspx, you can't find these lightswitch prerequisites under the 'Products' tab.
The only way I could find them was by explicitly searching with the searchbox for 'lightswitch'.