If you want the full Sonic Frontiers experience — including the Final Horizon story and extra characters — simply connect your console or PC to the internet and update through the official store. It’s free, legal, and safe.
Someone has taken an illegally copied Japanese Switch version of Sonic Frontiers , possibly a 1.41 update repack, split it into multiple RAR files, and labeled it misleadingly.
The string “nspjpupdate 141 2rar” appears to be a — likely from unauthorized distribution sites. “NSP” typically refers to Nintendo Switch game package dumps (illegally distributed), “jp” might indicate a Japanese region version, and “141” and “2rar” suggest a split RAR archive of an unofficial update.