Avoid: GetIntoPC, OceanofGames, PirateBay (high risk).
Adobe never released an official portable version of CS6. Any portable version you find has been cracked or repacked by a third party. However, if you own a legitimate CS6 license (serial number), you are legally allowed to create your own portable version for personal backup use, though this technically violates the EULA regarding modification. Adobe Photoshop Cs6 Portable