In most case the msg tells that you have an older version of Intel C++ Composer XE IDE integration installed. Because the IDE integration from current installation is newer, the installation will uninstall the older version and install the newer one.
Our IDE integration allows you to select an older version of Intel C++ Compiler. But we can not maintain unlimited versions. So the msg says that the IntelC 11.0 will not be available from the new IDE integration. But IntelC 11.1 and later will be.
does it make sense for you now?
So in most case you do not need to worry about it. But if you still want to use the older compiler 11.0 from the VS IDE, you need to uninstall the new one and reinstall the older version.