Maybe it is the classic. Im not sure. This is what i saw C:\Program Files\MultiBit-0.5.17
And i also saw a multibithd folder then i tried to click the .exe and the icon shows different from my wallet. It has HD inside the B of bitcoin while mine doesnt hav. So maybe it is classic what i have. So you mean i wont lose the bitcoin but i wont have it until i revert it. I hope i wont lose my bitcoin if i made a mistake reverting. I am  hoping for your guide. thanks