SolvedChanging the sky texture

Soo... I've recently seen this video called ''the biggest hack ever-unturned'' and it shows that he changed the yukon snowy skies to clear blue skies. Could someone please help and make a tutorial on maybe changing the night sky to day?

i saw that video too. but it doesnt work on multiplayer

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btw how do i post a on this website?

its already been updated no one can do it except for the ones that has ESP...