The "CS7" name is likely a mix-up between two distinct eras of Photoshop:
Below is an overview of what users typically mean by this keyword and why "portable" versions are popular—but risky. 1. The Confusion: Photoshop 7.0 vs. Creative Suite Portable Photoshop Cs7
Finding information about "Portable Photoshop CS7" can be a bit tricky because as an official product from Adobe. The "CS7" name is likely a mix-up between