Run it
Copy the script and paste it into your executor.
local button = script.Parent
button.MouseButton1Click:Connect(function()
local oldSky = game.Lighting:FindFirstChildOfClass("Sky")
if oldSky then
oldSky:Destroy()
end
local sky = Instance.new("Sky")
sky.Name = "CustomSky"
-- change these IDs to whatever sky you want
sky.SkyboxBk = "rbxassetid://93032034346" --change to your sky id
sky.SkyboxDn = "rbxassetid://93032034346" --change to your sky id
sky.SkyboxFt = "rbxassetid://93032034346" --change to your sky id
sky.SkyboxLf = "rbxassetid://93032034346" --change to your sky id
sky.SkyboxRt = "rbxassetid://93032034346" --change to your sky id
sky.SkyboxUp = "rbxassetid://93032034346" --change to your sky id
sky.Parent = game.Lighting
end)sky script

Universal