KeyShot does not have a standalone "Portable" edition in the traditional sense of a "no-install" application (like a .exe you run from a USB drive). However, its architecture and licensing options are designed to facilitate high portability and mobility for professional workflows across different environments.
Here is a blog post exploring the reality of portable rendering and how to maintain a mobile workflow. The Myth of "KeyShot Portable": Can You Render on the Go? keyshot portable
If you are a user with a floating license and IT approval, setting up a portable environment usually follows these steps: KeyShot does not have a standalone "Portable" edition
What you need: