Do the following:
- Download SQL Server 2014 Express with Advanced Services from Microsoft website. When choosing the required download, make sure you selected the file whose name contains SQLEXPRADV - for example, SQLEXPRADV_x64_ENU.exe.
Run the installation package and follow the instructions of the wizard until you get to the Feature Selection page. On this page, ensure that the Reporting Services option is selected under Instance Features.
Proceed with the wizard until you get to the Server Configuration page. On this page, ensure that the SQL Server Reporting Services will run under the Network Service account, and its startup type is set to Automatic.
- Follow the instructions of the wizard to complete the installation.