@Retro the model on gumroad you are thinking of is Ump9 which is the sister of 45 not 45 herself. There is an mmd of 45 but this looks like to be a different model though. Maybe you should do your own research before calling others out.
Sweet, thank your for this! Btw this character and their skins were never released for the game so its really cool to see them being used somewhere else. If you ever want to work on other models from this game(Necropolis) let me know because I can extract them pretty easily but I'm not good at making rigs.
I've been taking models out from Necropolis as well. May I ask how are you getting the model to work for vrc though. The models come out as ASCII FBX so I can't use blender to fix the bones. Are you using autodesk or do you know a way to get them to work for blender?