If you specifically want a version similar to what scammers pretend CS7 would have been, real CS6 green editions do exist. These are community-modified versions that have been stripped down to reduce file size—some as small as 42.5MB—and can run without installation.
: The GNU Image Manipulation Program (GIMP) is the most powerful open-source alternative to Photoshop and is available in portable editions for both Windows and Mac. GIMP 3.0 introduces non-destructive editing, improved color management, better PSD import/export, and a more modern interface. While GIMP has a steeper learning curve than PhotoDemon, it offers more advanced features and is suitable for serious graphic design work. Portable versions of GIMP 3.0.2 are available and can run directly from a USB drive. Portable Photoshop Cs7
: Adobe transitioned from the Creative Suite (CS) series directly to Creative Cloud (CC) in 2013. If you specifically want a version similar to