In deinstalling a named instance of SQL Server 2012 from a Production server, inadvertantly, I selected SSIS as a product to deinstall. Now, I need to reinstall it with the least disruption possible.
Run the installer again.
Run SQL Server setup program and on the “Feature Selection” page click the checkboxes associated with the features you would like to have installed. When finish, reapply any service pack the instance have applied before.