Hello,
First you have to install OpenIV (just google it). Check the GTA V option e.t.c.
Then you must install ASIManagaer and OpenIV.asi (this blue window which is saying you must install ASI)
Turn on edit mode, go to \update\x64\dlcpacks\patchday16ng\dlc.rpf\x64\models\cdimages\patchday16ng.rpf\.
You can see alert that says you are not in mods folder. Press "Copy to mods folder" button.
Now open RAR folder with these ped skins and drag files from s_m_y_cop folder to location:
mods\update\x64\dlcpacks\patchday16ng\dlc.rpf\x64\models\cdimages\patchday16ng.rpf\
I hope I helped. (I'm not English so I could made some mistakes)