You can plug your USB drive into any compatible computer and use the software instantly.
If you absolutely must use Photoshop, the official is highly accessible. It provides the absolute latest version of Photoshop, Lightroom, and cloud storage for a relatively low monthly fee. This gives you access to game-changing modern features like Generative Fill, neural filters, and automatic sky replacement with total security and cloud backup. Summary: Is Photoshop CS6 Portable Worth It?
The Rise, Risks, and Reality of Adobe Photoshop CS6 Portable