In the past, Intel included Microsoft Visual Shell with their Fortran compilers. The VS Shell took away the need for Intel Fortran users to buy a full Visual Studio license to use with their compiler.
Microsoft recently decided no longer to offer a Shell version and to drop the support for Visual Studio Shell 2015. This means Intel will no longer provide a VS Shell with their product after the release of Intel Visual Fortran version 19.0 Update 2. Read more about this at https://software.intel.com/en-us/articles/further-information-on-deprecation-and-removal-of-microsoft-visual-studio-shell-from-ivf
This means as long as you run Intel Parallel Studio Composer Edition version 19.0.2 or earlier you can install the compiler with the shell. If you want to use version 19.0.3 (or later) you will have to buy a separate license of Visual Studio to run your compiler on. You will always find the latest version, but also older versions of your compiler in your IRC account.
For more information about what the different updates includes in version 19, please see https://software.intel.com/en-us/articles/intel-visual-fortran-compiler-190-for-windows-release-notes-for-intel-parallel-studio-xe-2019.