VaM isn't really a game engine, it's an artwork engine like Daz3D.
I prefer Ren'py, simple and easy for developers aswell. Unity is good, but it's usually abit slow which ruin game experience.
I'm a big fan of HTML games and QSP aswell if you have several monitors, not many good QSP games though.
This is what it says, nothing about two directories or anything like that.
Installation:
1 - Apply 1.10.D patch
2 - Run game (long pause to install patch)
3 - Delete file name "Updated" from main folder [or second context patch won't work, F scenes will show up black]
4 - Apply 1.10.F patch
5 -...