Purpose
SmartAssembly allows you to use any version of SQL for its internal database. This will help you connect to LocalDB.
Steps
For LocalDB the connection string usually takes the form Server=(LocalDB)\mssqllocaldb
Please note, in case of having more than one version of LocalDB installed, this connects to the default instance.
Requirements
SmartAssembly 6.12+
LocalDB.
Each instance of Smart Assembly will need it's settings updated to point to this db