A "portable" version of Dreamweaver CS5 is not an official product released by Adobe. These versions are typically created by third parties using "thin-app" virtualization or by stripping away the installation and licensing components.

Microsoft offers an official "Portable" mode for VS Code. It is free, highly customizable, and supports all modern web standards.

Understanding Dreamweaver CS5 Portable: Features, Legacy, and Risks

A "portable" version is a third-party repackaged edition designed to run from a folder or USB without a traditional installation.