SQL Server Compact has been deprecated and is no longer included in VS.
"SQL Server compact edition is in deprecation mode with no new releases planned near future. Last release SQL CE 4.0SP1 (and earlier releases that are still in the support cycle) will continue to be supported through its lifecycle and Microsoft is committed to fix any major, production blocking issues found in these releases. "
SQL Server Compact 4.0 is supported until 2016:
SQLite is an alternative, as you can see here: https://sqlitepcl.codeplex.com/
Free, embedded database that software developers can use for building ASP.NET websites and Windows desktop applications.
Has a small footprint and supports private deployment of its binaries within the application folder, easy application development in Visual Studio and seamless migration of schema and data to SQL Server.