1. Drag add004 contents of zip into your mugen folder.
2. Copy the common1.cns file from the add004 folder you want to use into the same directory of the SP version you want to use (either /clash/96/ or /clash/384/)
3. Open system.def and change this line:
fight = ../fight.defto this
fight = ../../[add004 folder you want to use]/res/fight_480p.def4. Patch your characters and play.
Spoiler: directory and code should look something like this (click to see content)