I read on some product description, that Intel C++ Compiler is/was part of the INDE package.
Since I purchased a "Intel® Media Server Studio – Professional Edition" license, which seems to be the predecessor (not sure?), and even INDE is out dated, I wonder if C++ compiler license is part of the "Media Server Studio"?
Intel® Media Server Studio is for developing Media applications where Intel® INDE was for client desktop and mobile app development. Media Server Studio does not contain any compiler components. They are no correlation between the two products. They serve different market segments.
INDE is no longer available for new users however most tools within Intel® INDE are now available as standalone downloads. Refer to the web page at: https://software.intel.com/en-us/intel-inde-support
The compiler and other tools and libraries are still available as part of the larger Intel® System Studio and Intel® Parallel Studio products.
Hope that answers your question but please let me know if you need any further clarifications outside of the INDE support web page link I listed above, thanks.