A standard installation of CorelDRAW X6 writes thousands of entries into the Windows Registry (HLKM, HKCU), copies DLLs to System32, and creates start menu shortcuts. A portable version encapsulates all of this into a single executable or a compressed folder.
Promoting a portable version of a discontinued software suite is not without serious caveats. Portable CorelDRAW Graphics Suite X6 16.3.0.1114 SP3