A "portable" version of software typically means an application that can run from a USB drive or a folder without formal installation—no registry entries, no start menu shortcuts, and no dependencies on a specific machine. In theory, a portable SolidWorks 2012 would allow you to use the CAD software on any Windows computer simply by plugging in a drive.
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If you need help accessing SolidWorks legally for low cost or educational use, let me know—I can guide you to official programs. A "portable" version of software typically means an