The standard sets were messy. They had missing graphics in Metal Slug 3 . They had audio desync in Garou: Mark of the Wolves . They were the scars of the early internet, ripped by amateurs with slow dial-up connections. But this... this was the '52a'. The legendary revision that fixed the scanline timing and included the encryption keys for the prototype boards.
Search for neoragex_5.2a.zip (MD5 checksum: C9E7B2A1... ). Extract it to C:\NeoRAGEx\ (avoid Program Files to prevent permission issues).
: The pillars of 2D weapon and hand-to-hand combat.