I think you need to extract the downloaded 7z file to "modmanager/Games/DMC5/Mods" first. And make sure there's a folder with path like this: "modmanager/Games/DMC5/Mods/NeroHairstyle/natives/". If not, you need to move the "NeroHairstyle" folder to "modmanager/Games/DMC5/Mods". The tutorial video by FluffyQuack (https://www.youtube.com/watch?v=8BykRnBiQ6o , 2:26) may help.
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And make sure there's a folder with path like this: "modmanager/Games/DMC5/Mods/NeroHairstyle/natives/". If not, you need to move the "NeroHairstyle" folder to "modmanager/Games/DMC5/Mods".
The tutorial video by FluffyQuack (https://www.youtube.com/watch?v=8BykRnBiQ6o , 2:26) may help.