I chose the PC download option, then clic on "Open" option.
After it download, I clic on the Zip file with right button and clic on "Extract all". (I don't know in English if it's write it, but in french it's "Extraire tout" so I guess, in English it should be :extract all... or something like this)
I put the new file on my desktop (called "BTS-all") then go in, and clic on the link with Jungkook's face as an emoticon called "To the Edge of Sky". (*do not choose the ".sh", it doesn't work)
And it works. :)
I hope this explanation will help you :)
Tell me if you succed to play!