LocalDB is a special, low impact version of the SQL Server engine, that is not installed as a Windows Service, but launched (made to run) on demand by the ADO.NET client opening a connection to it. It is intended for single user scenarios, and not for any production use – for production you should use … Read more
According to Aaron Bertand: You need to verify that the SQL Server service is running. You can do this by going to Start > Control Panel > Administrative Tools > Services, and checking that the service SQL Server (SQLEXPRESS) is running. If not, start it. While you’re in the services applet, also make sure that … Read more
When you can’t apply Juki’s answer then after selecting the desired version of media you can use Fiddler to determine where the files are located. SQL Server 2019 Express Edition (English): Basic (~249 MB): https://download.microsoft.com/download/7/c/1/7c14e92e-bdcb-4f89-b7cf-93543e7112d1/SQLEXPR_x64_ENU.exe Advanced (~790 MB): https://download.microsoft.com/download/7/c/1/7c14e92e-bdcb-4f89-b7cf-93543e7112d1/SQLEXPRADV_x64_ENU.exe LocalDB (~53 MB): https://download.microsoft.com/download/7/c/1/7c14e92e-bdcb-4f89-b7cf-93543e7112d1/SqlLocalDB.msi SQL Server 2017 Express Edition (English): Core (~275 MB): https://download.microsoft.com/download/E/F/2/EF23C21D-7860-4F05-88CE-39AA114B014B/SQLEXPR_x64_ENU.exe Advanced (~710 … Read more