Microsoft Visio remains the industry standard for professional diagramming, floor plans, and flowcharts. The "portable" version is often sought by users who need to run the software from a USB drive without a full system installation or administrative privileges.
Microsoft does not offer an official "portable" version of Visio. Because Visio is a complex piece of software with deep integrations into the Windows registry and system files, official versions must be installed via the Office Deployment Tool (ODT) or the Microsoft 365 portal. Microsoft Visio Portable Download