AFAIK, The recent IIDX upgrade packs (since Pinky Crush 2025082500), despite of showing to be a "LDJ module", the game runs like "TDJ" (native 120fps, a second window appears and the physical numkeys won't work). So, for those who still uses 60hz monitors, they'll face issues like boot failure (pinky crush) or half speed gameplay (Sparkle Shower). So, to fix those issues, the module needs to be patched to force "LDJ-012 mode" via spice2x config>patches to boot the game correctly.
Also, learn to scratch again because the controls are kinda affected with that patch or buy a high frequency monitor 😅
i'll be reading further documentation from two-torial because i'm having controller issues.