Your problem is different from mine. I can start iGo using the default skin, then I couldn't switch to a custom screen (now I can :-). But you cant's even start iGo using the defaut skin.
Try this: [Only registered and activated users can see links. ]
You have to download the "for_s8.zip" file from the provided link, then copy it into the "iGO\ux" folder in your phone.
It works in my S8.
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