The keyword refers to a version of the software that does not require a standard installation process. Typically, a portable application is packaged to run from an external drive (like a USB thumb drive) or a folder on the desktop.
Using a cracked portable version is software piracy. Minitab actively monitors for unauthorized use. Corporations found using pirated software face fines up to $150,000 per copy under the Digital Millennium Copyright Act (DMCA). Students could face expulsion or legal action from their university. Minitab 16.1.0 Portable