1)Forget skin folder!! We don't have skin folder!
2)take theese 3 skins!
Spoiler: link
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(Unzip the file first)
Pongo , Arimi , Navy_blue and put all of them to the path

Android/data/com.nng.igo.primong.igoworld/
files
Inside files folder.!!

If you want to use one skin of them! For example Pongo skin

Rename-> ux_pongo folder to-> ux!!

That's it