If you actually own a valid CS6 license (serial key), you can install the software directly onto an external SSD via a full Windows installation (Windows To Go). This is the only legal "portable" method.
Despite its age, the CS6 version introduced several pillars of modern video editing: Mercury Playback Engine Adobe Premiere Pro Cs6 Portable
Using these versions carries significant security and legal risks: Malware & Viruses If you actually own a valid CS6 license