If you need truly portable diagramming without legal or security risks, consider these options:
Portable software, also known as "portable applications," refers to software that can be run from a portable device, such as a USB drive, CD, or DVD, without requiring installation on a host computer. Portable software is designed to be self-contained, with all necessary files and settings stored on the portable device. This allows users to run the software on any computer, without making changes to the host system. Visio 2007 Portable
This method is fragile. Missing dependencies will cause crashes when trying to insert shapes or save files. If you need truly portable diagramming without legal
A standard software installation involves an installer package that copies files to system directories, writes keys to the Windows Registry, and creates shortcuts across the operating system. If you move the installed folder to another computer, the software usually fails to run because it cannot find the necessary registry entries. This method is fragile
Draw.io (now diagrams.net) offers an that runs without installation. It can import legacy Visio 2007 (.vsd) files (though complex shapes may break). It saves to local drive, Google Drive, or OneDrive. Size: ~70MB.