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
The HD remaster is still reportedly purchasable on these legacy storefronts if you have the hardware. Jet Set Radio Free Download
Here is the current state of how to play the series legally and what's coming next: Current Availability The sequel remains an original Xbox exclusive and
Since official digital versions are scarce, many fans turn to these community-driven methods: Jet Set Radio Free Download
If you already bought the game on Steam or Xbox 360 before the delisting, it remains in your library and available for download.