Unity Hub itself is not officially portable, but you can force it:
A refers to a self-contained Unity Editor installation that does not rely on system-wide registry entries, admin privileges, or the Unity Hub. The Top approach focuses on best practices, stability, and modular control. unity portable install top
For those who find command-line intimidating, the open-source community has created launchers that encapsulate Unity Hub. Unity Hub itself is not officially portable, but
Allows moving between computers instantly. unity portable install top
If you need a true sandbox (e.g., for running two different Unity versions that conflict, or for use on locked-down corporate PCs where you cannot write any files to C:), application virtualization is the "top" technical answer.