I made an account just to provide words meant to dissuade anyone from the pain that is making this model vrc/blender ready. If you purchase the package, which I have done, there are only png files. If you manage to do things properly and get them into a 3D modeling program, good luck from there. The armature has weight painting issues, clipping, oddities, bones in the same space that must be merged manually, quirks, things that prevent it from being mobile-ified, horrible performance implications.
The bake time for textures took an ungodly amount of time and system resources. The process consumed all 64GB of my system memory and would very likely fail on any smaller systems. All in all, everything took me about a week of just straight work and I have considerable knowledge in respect to getting everything in my 3D modeling program. Unity work took long as well. And I'm still not done!
This work was done on a commission basis for a friend and as such, I will not be distributing my work as I still even have complaints with how it currently is and as it stands, it isn't even mobile compatible. Even when I do reach such a goal, I will not be distributing it. This is proof it can be done, but I would really not recommend it. Save yourself the sanity. I will not be disclosing any usernames to pursue. Their model and my version is protected with kanna protect.
That's all.