The HD remaster is still reportedly purchasable on these legacy storefronts if you have the hardware.
The sequel remains an original Xbox exclusive and was never ported to PC or modern consoles. It is playable on an original Xbox or an Xbox 360 via backward compatibility. Community Alternatives Jet Set Radio Free Download
Since official digital versions are scarce, many fans turn to these community-driven methods: The HD remaster is still reportedly purchasable on