BHUNP Body: I Broke it Again PLZ HELP Trying for hours

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I am trying to install this with physics included.

 

https://www.nexusmods.com/skyrimspecialedition/mods/31126?tab=description

 

1st of all I want to be sure I dont need to make a new game to make it work.

It broke while I was trying to fix SOS (Was not able to edit size)

I followed the instrucctions, No idea what Im doing wrong. I asm not entirely sure about the bodyslide part. I am not interested in much customization, just a nice looking body with the physics.... SOS part of the mod seems to be working, females have the underwear thing and regular body.