The version (often referred to as the "Free Edition" when downloaded as a ZIP file) is a standalone package. Unlike the standard installer, which writes registry keys and program files to your system drive, the portable version is self-contained. It typically comes in a ZIP or RAR archive that you simply extract to a folder—often on a USB flash drive—and run the executable directly.
Extract the contents to a high-speed USB 3.0 drive. diskgenius portable