All you need to do is take the given pak file and put it into the pak folder for Kingdom Hearts III (this can also go within the ~mods folder)

This will allow both Kairi and Roxas to do 2.5 combos instead of their usual 1.

CREDITS:
HeartlessSeph showed me the ropes on how to do this and was basically vital for this mods existance. Make sure to go show him some love!
HeartlessSeph: https://www.youtube.com/user/HeartlessSeph



-critic