Grab the Base XCI (US) + separate Update NSP files. This combo is the most stable for forwarders.

The search for represents more than just file hunting—it reflects a desire to preserve a specific version of Sonic’s most ambitious adventure. The US version, with its unique pre-order costumes, save bonuses, and specific update timing, stands apart from its European and Japanese counterparts.

If these are missing, you have an EU or JP release, not the true pack.