Note on terminology: Adobe has never released an official portable version of Illustrator. Any "Portable CS6" is an unauthorized repack (usually by PortableAppZ or other groups) designed to run from a USB drive without installation.

Convenience: The ability to use Illustrator on any compatible Windows computer without having to install or uninstall the software makes it incredibly convenient for freelance designers, students, or anyone who works across different locations.

It looks like you're asking for a review of a "Adobe Illustrator Portable CS6" from a site like portableapps.com (or a similar domain). However, I need to give you a clear and honest warning first:

How to tell a site or download is risky

If you’d like, I can: